Original prusa I3 mk3 User manual

Table of Contents

1. Introduction 9 ......................................................................................................................

Step 1 - Preparing the upgrade kit 10 .............................................................................

Step 2 - Getting the necessary tools 10 .........................................................................

Step 3 - Additional utilities for this guide 11 .................................................................

Step 4 - Labels guide 11 ....................................................................................................

Step 5 - Spare bag 12 ........................................................................................................

Step 6 - Printed parts - versioning 12 .............................................................................

Step 7 - Printed parts - self printing 13 ..........................................................................

Step 8 - Printable parts - Silver to Black PSU 14 .........................................................

Step 9 - Printed parts post-processing 15 .....................................................................

Step 10 - We are here for you! 16 ....................................................................................

Step 11 - Pro tip: inserting the nuts 17 ............................................................................

Step 12 - View high resolution images 17 ......................................................................

Step 13 - Important: Electronics protection 18 .............................................................

Step 14 - Reward yourself 19 ............................................................................................

Step 15 - How to successfully finish the assembly 20 ................................................

Step 16 - Prepare your desk 21 ........................................................................................

1a. Parts check 22 ...................................................................................................................

Step 1 - Introduction 23 ....................................................................................................

Step 2 - Preparing the printer 23 ....................................................................................

Step 3 - Heatbed inspection 24 .......................................................................................

Step 4 - X-axis smooth rods inspection 24 ...................................................................

Step 5 - Y-axis smooth rods inspection 25 ....................................................................

Step 6 - Printer frame inspection 25 ..............................................................................

Step 7 - Can I open the Haribo? 26 ................................................................................

Step 8 - Let's get started 26 .............................................................................................

1b. Printer disassembly 27 ...................................................................................................

Step 1 - Tools necessary for this chapter 28 .................................................................

Step 2 - Opening the electronics box 28 .......................................................................

Step 3 - Disconnecting cables 29 ...................................................................................

Step 4 - Removing the Einsy-base 29 ............................................................................

Step 5 - Removing the Einsy-door 30 ............................................................................

Step 6 - Removing the heatbed 30 .................................................................................

Step 7 - Dismantling cable management 31 .................................................................

Step 8 - Removing the LCD assembly 31 ......................................................................

Step 9 - Dismantling the Y-axis: removing the belt 32 ...............................................

Step 10 - Removing the Y-axis assembly 32 .................................................................

Step 11 - Removing the Z-axis-tops 33 ...........................................................................

Step 12 - Removing the cable-holder 33 ........................................................................

Step 13 - Removing the X-axis assembly 34 .................................................................

Step 14 - Removing the Z-axis motors 34 .....................................................................

Step 15 - Removing the Z-axis-bottoms 35 ...................................................................

Step 16 - Removing the Y-motor 35 ...............................................................................

Step 17 - Disconnecting the power cables (Black PSU) 36 ........................................

Step 18 - Disassembling the Y-carriage: belt 36 ..........................................................

Step 19 - Dissasembling the Y-carriage: rod holders 37 .............................................

Step 20 - Disassembling the Y-carriage: bearings 37 ................................................

Step 21 - Disassembling the X-axis: Removing the pulley 38 ...................................

Step 22 - Removing the X-axis motor 38 ......................................................................

Step 23 - Removing the X-axis smooth rods 39 ..........................................................

Step 24 - Removing the X-axis bearings 39 .................................................................

Step 25 - Removing the X motor pulley 40 ...................................................................

Step 26 - For new users of black PSU 40 .....................................................................

Step 27 - Parts summary I. 41 ..........................................................................................

Step 28 - Parts summary II. 41 ........................................................................................

Step 29 - Don't throw away 42 ........................................................................................

Step 30 - Can I take a gummy bear yet? 42 .................................................................

Step 31 - Well done 43 ......................................................................................................

1c. Parts preparation 44 ........................................................................................................

Step 1 - Tools necessary for this chapter 45 .................................................................

Step 2 - Removing the heatbed cable cover 45 ............................................................

Step 3 - Removing the heatbed thermistor 46 .............................................................

Step 4 - New heatbed thermistor: parts preparation 46 .............................................

Step 5 - Preparing the heatbed and thermistor 47 ......................................................

Step 6 - Covering the thermistor 47 ...............................................................................

Step 7 - Fixing the thermistor in place 48 .....................................................................

Step 8 - M3nEs nuts: parts preparation 48 ...................................................................

Step 9 - Inserting the M3nEs nuts 49 ............................................................................

Step 10 - Cable clips: parts preparation 49 ...................................................................

Step 11 - Installing the cable clips 50 .............................................................................

Step 12 - Installing the cable clips 50 ............................................................................

Step 13 - PG-front-case: parts preparation 51 ..............................................................

Step 14 - Assembling the PG-front-case 51 ..................................................................

Step 15 - Stickers and labels: parts preparation I. 52 ..................................................

Step 16 - Stickers and labels: parts preparation II. 52 ................................................

Step 17 - xLCD-cover sticker (optional) 53 ....................................................................

Step 18 - xLCD-cover sticker (optional) 53 ...................................................................

Step 19 - PG-case sticker (optional) 54 .........................................................................

Step 20 - PG-case sticker (optional) 54 .........................................................................

Step 21 - Sticking the serial number label 55 ...............................................................

Step 22 - Safety label (optional) 55 ................................................................................

Step 23 - Parts summary I. 56 .........................................................................................

Step 24 - Parts summary II. 56 ........................................................................................

Step 25 - Don't throw away 57 ........................................................................................

Step 26 - Still no sweets? 57 ...........................................................................................

Step 27 - That's it 58 .........................................................................................................

2. Frame assembly 59 ...........................................................................................................

Step 1 - Tools necessary for this chapter 60 .................................................................

Step 2 - xBuddy box: parts preparation 60 ...................................................................

Step 3 - Mounting the xBuddy box: parts preparation 61 ...........................................

Step 4 - Mounting the xBuddy box 61 ............................................................................

Step 5 - Mounting the xBuddy box 62 ...........................................................................

Step 6 - Mounting the xBuddy box 62 ...........................................................................

Step 7 - Applying the thermal pads 63 ..........................................................................

Step 8 - Mounting the xBuddy board 63 .......................................................................

Step 9 - Attaching the zip ties 64 ...................................................................................

Step 10 - Preparing Y-belt-idler (part 1) 64 ...................................................................

Step 11 - Preparing Y-belt-idler (part 2) 65 ...................................................................

Step 12 - Mounting the Y-belt-idler 65 ..........................................................................

Step 13 - Assembling the Y motor: parts preparation 66 ...........................................

Step 14 - Assembling the Y motor 66 ............................................................................

Step 15 - Assembling the Y-motor-holder 67 ...............................................................

Step 16 - Assembling the Y-motor-holder 67 ...............................................................

Step 17 - Attaching the Y-motor-holder 68 ...................................................................

Step 18 - Haribo 69 ............................................................................................................

Step 19 - It's done! 69 ........................................................................................................

3. X-axis & X-carriage assembly 70 ................................................................................

Step 1 - Tools necessary for this chapter 71 ..................................................................

Step 2 - X-axis assembly: parts preparation 71 ............................................................

Step 3 - Assembling the X-end-motor 72 .....................................................................

Step 4 - Assembling the X-end-motor 72 .....................................................................

Step 5 - Assembling the X-end-idler 73 ........................................................................

Step 6 - Assembling the X-end-idler 73 ........................................................................

Step 7 - Assembling the X-end-idler 74 ........................................................................

Step 8 - Mounting the bearings: parts preparation 74 ................................................

Step 9 - Mounting the bearings: parts preparation (lubricating) 75 .........................

Step 10 - Lubricating the bearing 75 ..............................................................................

Step 11 - Lubricating the bearing 76 ...............................................................................

Step 12 - Inserting the bearings: X-end-motor 76 .......................................................

Step 13 - Inserting the bearings: bearing pads 77 ........................................................

Step 14 - Covering the bearings: X-end-motor 77 .......................................................

Step 15 - Inserting the bearings: X-end-idler 78 ..........................................................

Step 16 - Assembling the X-axis: parts preparation 78 ..............................................

Step 17 - Assembling the X-axis: Marking the bearings 79 .......................................

Step 18 - Assembling the X-axis: parts preparation (lubricating) 79 .......................

Step 19 - Lubricating the bearing 80 ..............................................................................

Step 20 - Lubricating the bearing 80 .............................................................................

Step 21 - Assembling the X-axis: Inserting smooth rods 81 .......................................

Step 22 - Assembling the X-axis: mounting the X-end-motor 81 .............................

Step 23 - Assembling the X-carriage: parts preparation 82 ......................................

Step 24 - Assembling the X-carriage 82 .......................................................................

Step 25 - Attaching the spacers 83 ................................................................................

Step 26 - Attaching the spacers 83 ................................................................................

Step 27 - Assembling the X-carriage-clip: parts preparation 84 ..............................

Step 28 - Assembling the X-carriage-clip 84 ...............................................................

Step 29 - Attaching the X-carriage-clip 85 ...................................................................

Step 30 - Attaching the X motor: parts preparation 86 ..............................................

Step 31 - Attaching the X motor 86 ................................................................................

Step 32 - Attaching the X motor: mounting the pulley 87 .........................................

Step 33 - Guiding the X belt: parts preparation 87 .....................................................

Step 34 - Guiding the X belt: X-end-idler 88 ...............................................................

Step 35 - Guiding the X belt: X-end-motor 88 .............................................................

Step 36 - Guiding the X belt: X-carriage 89 .................................................................

Step 37 - Assembling the X-carriage: final check 89 ..................................................

Step 38 - Haribo 90 ...........................................................................................................

Step 39 - It's done! 90 .......................................................................................................

4. Z-axis assembly 91 ............................................................................................................

Step 1 - Tools necessary for this chapter 92 .................................................................

Step 2 - Assembling the Z-bottoms: parts preparation 92 ........................................

Step 3 - Assembling the Z-bottoms 93 .........................................................................

Step 4 - Z motor assembling: parts preparation 93 ....................................................

Step 5 - Attaching the rubber pads 94 ..........................................................................

Step 6 - Installing the Z motors 94 .................................................................................

Step 7 - Z motor cable adapter: parts preparation 95 .................................................

Step 8 - Connecting the Z motor cable adapters 95 ...................................................

Step 9 - Connecting the Z motors 96 ............................................................................

Step 10 - Mounting the X-axis assembly: parts preparation 96 ................................

Step 11 - Mounting the X-axis and smooth rods 97 .....................................................

Step 12 - Assembling the X-axis and smooth rods 97 ................................................

Step 13 - Installing the X-axis assembly 98 ..................................................................

Step 14 - Assembling the trapezoidal nuts 98 ..............................................................

Step 15 - Installing the Z-top parts: parts preparation 99 ..........................................

Step 16 - Placing the Z-top parts 99 ...............................................................................

Step 17 - LoveBoard: parts preparation 100 ..................................................................

Step 18 - Assembling the LoveBoard 100 ......................................................................

Step 19 - Connecting the extruder main cable 101 ......................................................

Step 20 - Mounting the extruder main cable 101 .........................................................

Step 21 - Connecting the extruder main cable: parts preparation 102 .....................

Step 22 - Connecting the extruder main cable 102 .....................................................

Step 23 - Covering the X-carriage: parts preparation 103 .........................................

Step 24 - Covering the X-carriage: inserting the nylon filament 103 .......................

Step 25 - Attaching the X-cover-back 104 ....................................................................

Step 26 - Guiding the main-cable: parts preparation 105 ..........................................

Step 27 - Wraping the extruder main cable 106 ..........................................................

Step 28 - Wrapping the textile sleeve 106 .....................................................................

Step 29 - Ext-cable-holder: parts preparation 107 .......................................................

Step 30 - Ext-cable-holder: parts preparation 107 .......................................................

Step 31 - Wrapping the X motor cable 108 ...................................................................

Step 32 - Attaching the Ext-cable-holder 108 ..............................................................

Step 33 - Assembling the Ext-cable-holder 109 ..........................................................

Step 34 - Assembling the Ext-cable-holder 109 ..........................................................

Step 35 - Connecting the X motor cable adapter 110 .................................................

Step 36 - Attaching the Ext-cable-holder 110 ...............................................................

Step 37 - Reward yourself! 111 .........................................................................................

Step 38 - Here it is! 111 ......................................................................................................

5. Nextruder assembly 112 ...................................................................................................

Step 1 - Tools necessary for this chapter 113 ................................................................

Step 2 - Filament sensor: parts preparation 113 ...........................................................

Step 3 - Assembling the filament sensor 114 ................................................................

Step 4 - Assembling the filament sensor 114 ................................................................

Step 5 - Nextruder idler assembly: parts preparation 115 ..........................................

Step 6 - Assembling the extruder idler 115 ...................................................................

Step 7 - Assembling the extruder: parts preparation I. 116 ........................................

Step 8 - Assembling the extruder: parts preparation II. 116 .......................................

Step 9 - Assembling the extruder 117 .............................................................................

Step 10 - Assembling the gearbox 117 ............................................................................

Step 11 - Assembling the PG-ring 118 .............................................................................

Step 12 - Assembling the PG-assembly 118 ..................................................................

Step 13 - Checking the PG-assembly 119 ......................................................................

Step 14 - Assembling the Nextruder idler 119 ...............................................................

Step 15 - Covering the planetary gear 120 ....................................................................

Step 16 - Assembling the Idler-swivel: parts preparation 120 ...................................

Step 17 - Assembling the Idler-swivel 121 ......................................................................

Step 18 - Assembling the Idler-nut 121 ..........................................................................

Step 19 - Mounting the Idler-swivel assembly 122 ......................................................

Step 20 - Attaching the extruder: parts preparation 122 ............................................

Step 21 - Assembling the heatsink 123 ..........................................................................

Step 22 - Attaching the extruder 123 .............................................................................

Step 23 - Connecting the NTC thermistor 124 .............................................................

Step 24 - Assembling the hotend fan: parts preparation 124 ....................................

Step 25 - Assembling the hotend fan 125 .....................................................................

Step 26 - Inserting the hotend assembly: parts preparation 125 ..............................

Step 27 - Inserting the hotend assembly 126 ................................................................

Step 28 - Connecting the hotend cables 126 ................................................................

Step 29 - Assembling the fan-door: parts preparation 127 ........................................

Step 30 - Assembling the fan door 127 ..........................................................................

Step 31 - Assembling the fan-door 128 ..........................................................................

Step 32 - Assembling the fan-door 128 .........................................................................

Step 33 - Assembling the fan-door 129 .........................................................................

Step 34 - Assembling the fan-door 129 .........................................................................

Step 35 - Connecting the extruder cables 130 .............................................................

Step 36 - Connecting the print fan 130 .........................................................................

Step 37 - LoveBoard: Wiring check 131 .........................................................................

Step 38 - Covering the LoveBoard: parts preparation 131 ..........................................

Step 39 - Covering the LoveBoard 132 ..........................................................................

Step 40 - Covering the LoveBoard 132 ..........................................................................

Step 41 - Tensioning the X-axis belt 133 .......................................................................

Step 42 - Belt tension check 134 .....................................................................................

Step 43 - Testing the X-axis belt 134 .............................................................................

Step 44 - Haribo time! 135 ................................................................................................

Step 45 - The extruder is assembled 135 ......................................................................

6. xLCD assembly 136 ...........................................................................................................

Step 1 - Tools necessary for this chapter 137 ................................................................

Step 2 - xLCD assembly: parts preparation 137 ...........................................................

Step 3 - xLCD assembly: parts preparation (part 2) 138 .............................................

Step 4 - xLCD assembly: inserting the square nuts 138 .............................................

Step 5 - Installing the xReflector sticker 139 ................................................................

Step 6 - Assembling the xLCD-support-right 139 .......................................................

Step 7 - Installing the PE Faston 140 ..............................................................................

Step 8 - Assembling the xLCD-support-left 140 ..........................................................

Step 9 - xLCD cables: parts preparation 141 .................................................................

Step 10 - Connecting the PE cable 141 ...........................................................................

Step 11 - Attaching the knob 142 .....................................................................................

Step 12 - Attaching the xLCD assembly 142 .................................................................

Step 13 - Guiding the xLCD cable 143 ...........................................................................

Step 14 - Black vs Silver PSU 143 ...................................................................................

Step 15 - Connecting the PSU (Black PSU): parts preparation 144 ..........................

Step 16 - Connecting the PSU (Black PSU): PE cable 144 .........................................

Step 17 - Power cables info (Black PSU) 145 ................................................................

Step 18 - Connecting the PSU (Black PSU) 146 ...........................................................

Step 19 - Connecting the power panic (Black PSU) 147 .............................................

Step 20 - Guiding the Z motor right cable (Black PSU) 147 ......................................

Step 21 - Guiding the power cable bundle (Black PSU) 148 ......................................

Step 22 - Guiding the power cables (Black PSU) 148 .................................................

Step 23 - Y motor cable adapter (Black PSU): parts preparation 149 ......................

Step 24 - Connecting the X and Y motor cables (Black PSU) 149 ............................

Step 25 - Connecting the PSU cable (Black PSU): parts preparation 149 ..............

Step 26 - Connecting the PSU cables (Black PSU): PE cable 150 ............................

Step 27 - Connecting the PSU cables (Black PSU) 150 ..............................................

Step 28 - PSU - PE cable (Silver PSU): parts preparation 151 ...................................

Step 29 - Inserting M3nEs nut (Silver PSU) 151 ..........................................................

Step 30 - Guiding the PE cable (Silver PSU) 152 .........................................................

Step 31 - Connecting the PE cables (Silver PSU) 152 .................................................

Step 32 - Connecting the extended PE cable (Silver PSU) 153 .................................

Step 33 - Guiding the Z motor right cable (Silver PSU) 153 ......................................

Step 34 - Guiding the power cable bundle (Silver PSU) 154 .....................................

Step 35 - Guiding the power cables (Silver PSU) 154 .................................................

Step 36 - Power panic extended cable (Silver PSU): parts preparation 155 ...........

Step 37 - Extending the power panic cable (Silver PSU) 155 ....................................

Step 38 - Y motor cable adapter (Silver PSU): parts preparation 156 ......................

Step 39 - Connecting the X and Y motor cables (Silver PSU) 156 ...........................

Step 40 - Connecting the PE cable (Silver PSU) 157 ..................................................

Step 41 - Connecting the PSU cables (Silver PSU) 157 ..............................................

Step 42 - Connecting the power panic cable (Silver PSU) 158 .................................

Step 43 - Securing the PSU cables 158 .........................................................................

Step 44 - Guiding the Z motor left cable 159 ...............................................................

Step 45 - Connecting the xLCD cables 159 ..................................................................

Step 46 - Connecting the extruder main cable 160 .....................................................

Step 47 - Time for energy delivery! 160 .........................................................................

Step 48 - Almost there! 161 ..............................................................................................

7. Y-carriage & Heatbed assembly 162 ...........................................................................

Step 1 - Tools necessary for this chapter 163 ................................................................

Step 2 - Heatbed cable assembly: parts preparation 164 ...........................................

Step 3 - Heatbed cable assembly (part 1) 164 ...............................................................

Step 4 - Heatbed cable assembly (part 2) 165 ..............................................................

Step 5 - Heatbed cable assembly (part 3) 165 ..............................................................

Step 6 - Covering the heatbed cables: parts preparation 166 ...................................

Step 7 - Assembling the heatbed-cable-cover-bottom 166 ........................................

Step 8 - Assembling the heatbed-cable-cover: nylon filament 167 ..........................

Step 9 - Assembling the heatbed-cable-cover-bottom 167 .......................................

Step 10 - Assembling the heatbed-cable-cover-top 168 .............................................

Step 11 - Wrapping the textile sleeve 168 ......................................................................

Step 12 - Y-carriage variations 169 .................................................................................

Step 13 - Y-carriage (old): parts preparation 169 .........................................................

Step 14 - Y-carriage (old): parts preparation (lubricating) 170 ...................................

Step 15 - Lubricating the bearing (old) 170 ...................................................................

Step 16 - Lubricating the bearing (old) 171 ....................................................................

Step 17 - Assembling the bearing clips (old) 171 ..........................................................

Step 18 - Installing the bearing on the Y-carriage (old) 172 .......................................

Step 19 - Aligning the bearing (old) 172 .........................................................................

Step 20 - Installing the bearings on the Y-carriage (old) 173 ....................................

Step 21 - Y-axis: smooth rods holders (old) 173 ............................................................

Step 22 - Inserting smooth rods into Y-carriage (old) 174 ..........................................

Step 23 - Y-carriage: parts preparation (new) 175 .......................................................

Step 24 - Y-carriage (new): parts preparation (lubricating) 175 ................................

Step 25 - Lubricating the bearing (new) 176 .................................................................

Step 26 - Lubricating the bearing (new) 176 .................................................................

Step 27 - Assembling the bearing clips (new) 177 .......................................................

Step 28 - Installing the bearing on the Y-carriage (new) 177 .....................................

Step 29 - Aligning the bearing (new) 178 ......................................................................

Step 30 - Installing the bearings on the Y-carriage (new) 178 ..................................

Step 31 - Y-axis (new): smooth rods holders 179 ..........................................................

Step 32 - Inserting smooth rods into Y-carriage (new) 179 ........................................

Step 33 - Preparing Y-rod-holder 180 ............................................................................

Step 34 - Mounting the Y-rod-holder parts 180 ...........................................................

Step 35 - Installing the Y-carriage 181 ...........................................................................

Step 36 - Aligning the smooth rods 181 .........................................................................

Step 37 - Assembling the Y belt: parts preparation 182 .............................................

Step 38 - Assembling the Y belt 182 ..............................................................................

Step 39 - Assembling the Y belt 183 ..............................................................................

Step 40 - Assembling the Y belt holder 183 ..................................................................

Step 41 - Assembling the Y belt tensioner 184 .............................................................

Step 42 - Assembling the Y belt tensioner 184 ............................................................

Step 43 - Tensioning the Y belt 185 ................................................................................

Step 44 - Belt tension check 185 .....................................................................................

Step 45 - Aligning the Y belt 186 ....................................................................................

Step 46 - Installing the Expansion joints: parts preparation 186 ..............................

Step 47 - Preparing the expansion joints 187 ................................................................

Step 48 - Installing the Expansion joints 187 ................................................................

Step 49 - Attaching the heatbed: parts preparation 188 ............................................

Step 50 - Attaching the heatbed 188 .............................................................................

Step 51 - Tightening the heatbed 189 ............................................................................

Step 52 - Guiding the heatbed cables: parts preparation 189 ...................................

Step 53 - Guiding the heatbed cables 190 ....................................................................

Step 54 - Covering the heatbed cables 190 ..................................................................

Step 55 - Verify all connections once more! 191 ...........................................................

Step 56 - Installing the ESP module: parts preparation 191 ......................................

Step 57 - Installing the ESP module 192 .......................................................................

Step 58 - Covering the xBuddy box: parts preparation 192 .......................................

Step 59 - Covering the xBuddy box 193 ........................................................................

Step 60 - Covering the xBuddy box 193 ........................................................................

Step 61 - Assembling the double spool holder (part 1) 194 ........................................

Step 62 - Assembling the double spool holder (part 2) 194 .......................................

Step 63 - Assembling the Filament guide: parts preparation 195 ............................

Step 64 - Filament guide assembly (part 1) 195 ...........................................................

Step 65 - Filament guide assembly (part 2) 196 ..........................................................

Step 66 - Haribo time! 196 ...............................................................................................

Step 67 - That's it 197 ........................................................................................................

8. Preflight check 198 ............................................................................................................

Step 1 - Attaching the steel sheet 199 ............................................................................

Step 2 - Firmware update (part 1) 200 ...........................................................................

Step 3 - Firmware update (part 2) 200 ..........................................................................

Step 4 - Wizard - Selftest start 201 ................................................................................

Step 5 - Wizard - Loadcell Test 201 ...............................................................................

Step 6 - Wizard - Gearbox Alignment 202 ....................................................................

Step 7 - Wizard - Filament Sensor Calibration 202 ....................................................

Step 8 - Wizard complete 203 .........................................................................................

Step 9 - Reward yourself! 203 .........................................................................................

Step 10 - Loading a filament 204 ....................................................................................

Step 11 - Printable 3D models 204 ..................................................................................

Step 12 - PrusaSlicer for MK3.9 205 ..............................................................................

Step 13 - PrusaLink and Prusa Connect 205 ................................................................

Step 14 - Quick guide for your first prints 206 .............................................................

Step 15 - Prusa knowledge base 206 .............................................................................

Step 16 - Join Printables! 206 ..........................................................................................

Manual changelog MK3.9 upgrade 207 .........................................................................

Step 1 - Version history 208 .............................................................................................

Original Prusa i3 MK3/MK3S/MK3S+ to MK3.9 upgrade 9

1. Introduction

10 Original Prusa i3 MK3/MK3S/MK3S+ to MK3.9 upgrade

STEP 1 Preparing the upgrade kit

Welcome to our step-by-step guide

on upgrading your Original Prusa i3

MK3/MK3S/MK3S+ to the

Original Prusa MK3.9.

Prepare the upgrade kit received

from Prusa Research.

WARNING: Before you start

disassembling the printer, ensure

that you have successfully printed

all the required parts for the

upgrade.

STEP 2 Getting the necessary tools

The package includes:

Needle-nose pliers (1x)

Philips (PH2) screwdriver (1x)

Universal wrench (1x)

Wrench size 13 mm (1x)

Torx key set

Allen key set

1. Introduction

Original Prusa i3 MK3/MK3S/MK3S+ to MK3.9 upgrade 11

STEP 3 Additional utilities for this guide

Some steps in the manual will require commonly available items to help you with

assembly (not included in the kit):

Scissors - For cutting a bag with bearings

Permanent marker - choose black or another dark color. The marker will come in

handy a few chapters further, for marking bearings and magnets.

Paper towels or piece of cloth - For wiping residual grease off the bearings and

smooth rods and as a soft pad for preparing the Y-carriage assembly.

STEP 4 Labels guide

All the boxes and bags including parts for the build are labeled.

The labels include the list of contents and part count.

You can download a Cheatsheet with 1:1 fastener drawings from our site

prusa.io/cheatsheet-mk4. Print it at 100 %, don't rescale it, otherwise, it won't work.

For PRUSA veterans: Fasteners are divided into individual bags according to its

type. Not into packages for individual chapters, as it was with previous printers.

1. Introduction

12 Original Prusa i3 MK3/MK3S/MK3S+ to MK3.9 upgrade

STEP 5 Spare bag

There is a bag with spare parts like thermal pads, springs, etc.

Spare fasteners are included in each bag of fasteners. The numbers in parentheses

below the fastener picture indicate the number of extra pieces added to the SPARE

package.

STEP 6 Printed parts - versioning

Most of the 3D printed parts on Original Prusa MK3.9 are marked with their

version.

E, F and Gx series (e.g. E1) - those parts are printed on Prusa Research farm

and are distributed with the kit.

R, S and Tx series (e.g. R1) - those parts are available for download at

prusa.io/printable-parts-mk4. They are identical to the factory ones.

In case you have issues while assembling the printer with the certain printed part,

please try to find this label and tell it to our support team.

1. Introduction

Original Prusa i3 MK3/MK3S/MK3S+ to MK3.9 upgrade 13

STEP 7 Printed parts - self printing

Before we start disassembly, you need to print all the necessary parts.

Filaments (PETG) for printing all necessary parts are included in the UPGRADE

package.

G-codes and STL files are available on our website: prusa.io/printable-parts-mk4

For printing individual parts it is recommended to use PrusaSlicer with 0.2 mm

layer height, GRID infill at 15 %, no supports!

Fan-shroud must be printed from ASA/PC/ABS only!!! We include this part in the

upgrade package.

1. Introduction

14 Original Prusa i3 MK3/MK3S/MK3S+ to MK3.9 upgrade

STEP 8 Printable parts - Silver to Black PSU

This step is for users who have purchased the black 24V 240W PSU (Power

Supply Unit) and would like to replace an existing silver power supply unit during

the upgrade.

For this replacement, the following parts need to be printed in addition:

PSU-cover (1x)

Download the part from xLCD category on prusa.io/printable-parts-mk4

Print the parts according to the prescribed print settings in the description on

Printables.com.

1. Introduction

Original Prusa i3 MK3/MK3S/MK3S+ to MK3.9 upgrade 15

STEP 9 Printed parts post-processing

Some parts might require post-processing in order to be ready for assembly.

In general for all printed parts (We will use just a few parts as an example):

Each hole for a screw, nylon filament, etc. must be clean and free of any strings.

If there are any remnants of filament inside the hole, hand drill the holes with a

3mm drill bit. Do not use electric power tools!

All other holes, for example for the smooth rods, must be perfectly clean. If

there is any filament residue inside the hole, use a heat gun to melt it.

Optimal temperature for the heat gun is 250 °C (482 °F) and blow on the parts

from a distance of 10 - 15cm (4 - 6 inches).

Check the square and hexagon nut holes. There must be no filament debris

inside.

Check the parts for straightness. For example, by placing it on a clean table

surface. Bent parts can cause problems during installation and subsequent use

of the printer.

Do not modify any parts unless instructed to do so.

1. Introduction

16 Original Prusa i3 MK3/MK3S/MK3S+ to MK3.9 upgrade

STEP 10 We are here for you!

Lost in the instructions, missing screw or cracked printed part? Let us know!

You can contact us using the following channels:

Using comments under each step.

Using our 24/7 live chat here at help.prusa3d.com

Writing an email to [email protected]

1. Introduction

Original Prusa i3 MK3/MK3S/MK3S+ to MK3.9 upgrade 17

STEP 11 Pro tip: inserting the nuts

3D printed parts are very precise, however, there still might be a tolerance in the

printed part and same goes for the size of the nut.

Therefore it might happen, that the nut won't fit easily in or might be falling out.

Let's see, how to fix it:

Nut won't fit in: use a screw with a thread along its entire length (typically:

M3x10, M3x18) and screw it from the opposite side of the opening. While

tightening the screw, the nut will be pulled in. Remove the screw afterwards.

Alternative option: you can use X-holder tool included in the package. Insert

any screw (typically: M3x10 or M3x18) and screw the nut fully on the tip of the

thread. Push the nut into the printed part and remove the screw with X-holder.

Nut keeps falling out: Use a piece of tape to fix the nut temporarily in place, as

soon as you insert the screw in, you can remove the tape. Using glue isn't

recommended as it can partly reach into the thread and you won't be able to

tighten the screw properly.

Every time we recommend using the "screw pulling technique", you will be

reminded with Joe's avatar ;)

Parts in the pictures are used as an example.

STEP 12 View high resolution images

When you browse the guide on

help.prusa3d.com, you can view the

original images in high resolution

for clarity.

Just hover your cursor over the

image and click the Magnifier

button ("View original") in the top

left corner.

1. Introduction

18 Original Prusa i3 MK3/MK3S/MK3S+ to MK3.9 upgrade

STEP 13 Important: Electronics protection

WARNING: Make sure to protect the electronics against electrostatic discharge

(ESD). Always unpack the electronics right before you need them!

Here are some tips to prevent damage to the electronics:

Keep the electronics inside the ESD bag right until you are asked to install

them.

Always touch the sides of the board only while handling it. Avoid touching the

components on the surface.

Before you touch the electronics use any conductive (metal) structure nearby

to neutralize the possible static charge from your hands.

Be extra cautious in rooms with carpets, which are often a source of

electrostatic energy.

Clothes made of wool or certain synthetic fabrics can easily gather static

electricity too. It is safer to wear cotton clothing for the assembly.

1. Introduction

Original Prusa i3 MK3/MK3S/MK3S+ to MK3.9 upgrade 19

STEP 14 Reward yourself

Based on the feedback, building the MK3.9 printer is even more enjoyable

compared to the MK3S+. However, you should still treat yourself for every finished

chapter. Look in the box and find bag of Haribo Bears.

The biggest issue from our experience (MK3S+, MK3S, MK3, MK2S, ...) is

inadequate bear consumption. Many of you didn't have enough gummy bears for all

chapters, some even ate them all before they started!

After years of thorough scientific research, we came to a solution => At the end of

each chapter, you will be told a specific amount of bears to consume.

Eating incorrect amount than prescribed in the manual might lead to sudden boost

of energy. Please consult a professional in the closest candy store.

Hide the Haribo for now! From our experience an unattended bag with sweets will

suddenly disappear. Confirmed by multiple cases all around the World.

1. Introduction

20 Original Prusa i3 MK3/MK3S/MK3S+ to MK3.9 upgrade

STEP 15 How to successfully finish the assembly

To successfully finish the upgrade please follow all these:

Always read all the instructions at the current step first, it will help you to

understand what you need to do. Don't cut or trim unless you are told to!!!

Don't follow pictures only! It is not enough, the written instructions are as brief

as they could be. Read them!

Read the comments from the other users, they are a great source of ideas. We

read them too and based on your feedback improve the manual and the entire

assembly.

Use a reasonable force, the printed parts are tough, but not unbreakable. If it

doesn't fit, check your approach twice.

Most important: Enjoy the build, have fun. Cooperate with your kids, friends or

partners.

This manual suits for next models

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