Prusa research Original prusa mini User manual

Table of Contents

1. Introduction 5 ......................................................................................................................

Step 1 - All the required tools are included 6 ................................................................

Step 2 - Universal wrench - description 6 .....................................................................

Step 3 - Tools required for lubricating bearings 6 ......................................................

Step 4 - Labels guide 7 .....................................................................................................

Step 5 - Use labels for reference 7 .................................................................................

Step 6 - Spare bag 8 .........................................................................................................

Step 7 - View high resolution images 8 .........................................................................

Step 8 - We are here for you! 9 .......................................................................................

Step 9 - Important: Electronics protection 9 ................................................................

Step 10 - Pro tip: inserting the nuts 10 ...........................................................................

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

Step 12 - Reward yourself 11 ............................................................................................

Step 13 - How to successfully finish the assembly 12 .................................................

2. YZ - axis assembly 14 ........................................................................................................

Step 1 - Tools necessary for this chapter 15 ..................................................................

Step 2 - Y-carriage: parts preparation 15 .......................................................................

Step 3 - Y-carriage: parts preparation (lubricating) 15 ...............................................

Step 4 - Lubricating the bearing 16 ................................................................................

Step 5 - Lubricating the bearing 16 ................................................................................

Step 6 - Correct bearing orientation 17 ..........................................................................

Step 7 - Installing bearings on the Y-carriage 17 .........................................................

Step 8 - Heatbed spacers: parts preparation 18 ...........................................................

Step 9 - Installing the heatbed spacers 18 ....................................................................

Step 10 - Y-axis front: parts preparation 19 ...................................................................

Step 11 - Comparison of extrusions 19 ...........................................................................

Step 12 - Mounting the Y-plate-front 20 .......................................................................

Step 13 - Mounting the MINI-Y-plate-front 20 .............................................................

Step 14 - Y-belt-idler: parts preparation 21 ...................................................................

Step 15 - Preparing MINI-Y-belt-idler 21 .......................................................................

Step 16 - Preparing MINI-Y-belt-idler 22 .......................................................................

Step 17 - Mounting the MINI-Y-belt-idler 22 ................................................................

Step 18 - Y-axis smooth rods: parts preparation 23 ....................................................

Step 19 - Assembling the Y-carriage 23 ........................................................................

Step 20 - Mounting the Y-carriage 24 ...........................................................................

Step 21 - Y-axis rear: parts preparation 24 ....................................................................

Step 22 - Y-axis motor assembly 25 ...............................................................................

Step 23 - Mounting the Y-motor 25 ...............................................................................

Step 24 - Mounting the MINI-Y-rear-plate 26 ..............................................................

Step 25 - Anti-vibration pads: parts preparation 26 ...................................................

Step 26 - Anti-vibration pads installation 27 ................................................................

Step 27 - Y-axis belt parts 27 ...........................................................................................

Step 28 - Y-axis belt guidance 28 ...................................................................................

Step 29 - Aligning the Y-axis belt 28 .............................................................................

Step 30 - Y-belt tensioning 29 ........................................................................................

Step 31 - Y-axis assembly: reward yourself! 29 ............................................................

Step 32 - MINI-Z-bottom: parts preparation 30 ...........................................................

Step 33 - Assembling the MINI-Z-bottom 31 ...............................................................

Step 34 - Assembling the MINI-Z-bottom 31 ...............................................................

Step 35 - Buddy board: parts preparation 32 ...............................................................

Step 36 - Mounting the Buddy board 32 .......................................................................

Step 37 - LCD cable: parts preparation 33 ....................................................................

Step 38 - Connecting the LCD cable 33 ........................................................................

Step 39 - LCD cable guidance 34 ...................................................................................

Step 40 - Z-axis: parts preparation 34 ...........................................................................

Step 41 - Assembling the Z-axis 35 ................................................................................

Step 42 - Assembling the Z-axis 35 ...............................................................................

Step 43 - Assembling the Z-axis 36 ...............................................................................

Step 44 - Connecting the Y and Z-axis 36 ....................................................................

Step 45 - Joining the Y and Z-axis together 37 ............................................................

Step 46 - Joining the Y and Z-axis together 37 ............................................................

Step 47 - Aligning the YZ-axis assembly 38 .................................................................

Step 48 - Securing the YZ-axis assembly 38 ...............................................................

Step 49 - Guiding the Y-axis motor cable 39 ...............................................................

Step 50 - Y-axis motor cable guidance 39 ....................................................................

Step 51 - Z-top: parts preparation 40 .............................................................................

Step 52 - Assembling the MINI-Z-top 40 ......................................................................

Step 53 - Assembling the MINI-Z-top 41 ......................................................................

Step 54 - Z-axis smooth rods: parts preparation 41 ....................................................

Step 55 - Mounting the Z-axis smooth rods 42 ...........................................................

Step 56 - Installing the Z-axis bearings 42 ...................................................................

Step 57 - Mounting the MINI-Z-top assembly 43 ........................................................

Step 58 - Mounting the MINI-Z-top assembly 43 ........................................................

Step 59 - Plastic cover: parts preparation 44 ...............................................................

Step 60 - Securing the MINI-Z-top assembly 44 ........................................................

Step 61 - YZ-axis assembly: reward yourself! 45 .........................................................

Step 62 - YZ-axis is finished! 45 .....................................................................................

3. X-axis & Extruder assembly 47 .....................................................................................

Step 1 - Tools necessary for this chapter 48 .................................................................

Step 2 - Z-carriage: parts preparation 48 ......................................................................

Step 3 - Assembling the Z-carriage 48 ..........................................................................

Step 4 - Assembling the Z-carriage 49 ..........................................................................

Step 5 - X-end: parts preparation 49 .............................................................................

Step 6 - X-end: parts preparation (lubricating) 50 ......................................................

Step 7 - Lubricating the bearings 50 ..............................................................................

Step 8 - Lubricating the bearings 51 ..............................................................................

Step 9 - Marking the bearings 51 ....................................................................................

Step 10 - Assembling the X-end 52 ................................................................................

Step 11 - Assembling the X-end 52 .................................................................................

Step 12 - Assembling the X-axis 53 ................................................................................

Step 13 - Checking the smooth rods: X-end 53 ...........................................................

Step 14 - X-carriage: parts preparation 54 ....................................................................

Step 15 - Assembling the X-carriage 54 ........................................................................

Step 16 - Mounting the X-carriage 55 ............................................................................

Step 17 - X-axis motor: parts preparation 55 ................................................................

Step 18 - Assembling the X-axis motor 56 ....................................................................

Step 19 - Mounting the X-axis motor 56 .......................................................................

Step 20 - X-axis belt guidance 57 ...................................................................................

Step 21 - X-axis belt guidance 57 ....................................................................................

Step 22 - X-axis assembly: reward yourself! 58 ...........................................................

Step 23 - Z-carriage: parts preparation 58 ...................................................................

Step 24 - Preparing the Z-carriage 59 ...........................................................................

Step 25 - Mounting the X-axis 59 ...................................................................................

Step 26 - Mounting the X-axis 60 ..................................................................................

Step 27 - Plastic cover: parts preparation 60 ...............................................................

Step 28 - Guiding the X-axis motor cable 61 ................................................................

Step 29 - Connecting the X-axis motor 61 ....................................................................

Step 30 - X-axis belt tensioning 62 ................................................................................

Step 31 - Securing the X-end 62 .....................................................................................

Step 32 - Extruder motor: parts preparation 63 ...........................................................

Step 33 - Assembling the Extruder motor 63 ...............................................................

Step 34 - Extruder-front: parts preparation 64 ............................................................

Step 35 - Assembling the Extruder-front 64 ................................................................

Step 36 - Extruder-rear: parts preparation 65 ..............................................................

Step 37 - Assembling the Extruder-rear 65 ..................................................................

Step 38 - Extruder-idler: parts preparation 66 .............................................................

Step 39 - Assembling the Extruder-idler 66 .................................................................

Step 40 - Extruder assembly: parts preparation 67 .....................................................

Step 41 - Assembling the Extruder 67 ...........................................................................

Step 42 - Assembling the Extruder 68 ..........................................................................

Step 43 - Assembling the Extruder 68 ..........................................................................

Step 44 - Mounting the MINI-Extruder-idler 69 ..........................................................

Step 45 - Inserting the PTFE tube 69 ............................................................................

Step 46 - Inspection-door: parts preparation 70 ..........................................................

Step 47 - Mounting the Extruder 70 ...............................................................................

Step 48 - Mounting the Extruder 71 ...............................................................................

Step 49 - Extruder assembly: reward yourself! 71 .......................................................

Step 50 - X-axis is finished! 72 ........................................................................................

4. Print head & Heatbed assembly 73 .............................................................................

Step 1 - Tools necessary for this chapter 74 .................................................................

Step 2 - Hotend & Print fan: parts preparation 74 .......................................................

Step 3 - Mounting the hotend 74 ....................................................................................

Step 4 - Mounting the print fan 75 .................................................................................

Step 5 - Hotend fan: parts preparation 75 .....................................................................

Step 6 - Assembling the hotend fan 76 .........................................................................

Step 7 - Minda-holder: parts preparation 76 .................................................................

Step 8 - Assembling the Minda-holder 77 .....................................................................

Step 9 - Mounting the MINI-minda-holder 77 ..............................................................

Step 10 - SuperPINDA sensor: parts preparation 77 ...................................................

Step 11 - Installing the SuperPINDA sensor 78 ............................................................

Step 12 - Fan-spacer-clip: parts preparation 78 ...........................................................

Step 13 - Guiding the hotend cables 79 .........................................................................

Step 14 - Guiding the hotend cables 79 .........................................................................

Step 15 - Guiding the hotend cables 80 ........................................................................

Step 16 - PTFE tube - parts preparation 80 ..................................................................

Step 17 - Mounting the PTFE tube 81 .............................................................................

Step 18 - Print head: reward yourself! 81 .......................................................................

Step 19 - Heatbed: parts preparation 81 ........................................................................

Step 20 - Heatbed: parts preparation 82 .......................................................................

Step 21 - Assembling the heatbed 82 ............................................................................

Step 22 - Guiding the heatbed cables 83 ......................................................................

Step 23 - Covering the heatbed cables 83 ....................................................................

Step 24 - Covering the heatbed cables 84 ....................................................................

Step 25 - Covering the heatbed cables 84 ....................................................................

Step 26 - Mounting the heatbed assembly 85 .............................................................

Step 27 - Heatbed: reward yourself! 85 .........................................................................

Step 28 - Printhead and Heatbed are finished! 86 ......................................................

5. LCD assembly & Electronics 87 ...................................................................................

Step 1 - Tools necessary for this chapter 88 .................................................................

Step 2 - LCD assembly: parts preparation 88 ..............................................................

Step 3 - Mounting the LCD 88 ........................................................................................

Step 4 - Connecting the LCD 89 .....................................................................................

Step 5 - LCD cable guidance 89 .....................................................................................

Step 6 - LCD assembly: reward yourself! 90 ................................................................

Step 7 - Power switch: parts preparation 90 ................................................................

Step 8 - Mounting the power switch 90 ........................................................................

Step 9 - Connecting the power switch 91 .....................................................................

Step 10 - Filament sensor: parts preparation (optional) 91 ........................................

Step 11 - Filament sensor: parts preparation (optional) 92 .........................................

Step 12 - Filament sensor assembling (optional) 93 ...................................................

Step 13 - Filament sensor assembling (optional) 93 ...................................................

Step 14 - Filament sensor assembling (optional) 94 ...................................................

Step 15 - Filament sensor assembling (optional) 94 ...................................................

Step 16 - Filament sensor installation (optional) 95 ....................................................

Step 17 - Connecting the filament sensor (optional) 95 .............................................

Step 18 - Connecting the electronics 96 .......................................................................

Step 19 - Connecting the electronics 96 .......................................................................

Step 20 - Covering the electronics: parts preparation 97 ..........................................

Step 21 - Covering the electronics 97 ............................................................................

Step 22 - Gluing the silver label 98 ................................................................................

Step 23 - Electronics: reward yourself! 98 ....................................................................

Step 24 - LCD assembly & Electronics are finished! 99 .............................................

6. Spool holder assembly 100 ............................................................................................

Step 1 - Tools necessary for this chapter 101 ................................................................

Step 2 - Spool holder: parts preparation 101 .................................................................

Step 3 - Spool holder: parts preparation 101 .................................................................

Step 4 - Assembling the spool holder base(s) 102 .......................................................

Step 5 - Adding the spool holder rails 102 ....................................................................

Step 6 - Adjusting the spool holder width 103 .............................................................

Step 7 - Attaching anti-slip pads 103 .............................................................................

Step 8 - Spool holder assembly: reward yourself! 104 ................................................

Step 9 - Spool holder is assembled! 104 ........................................................................

7. Preflight check 105 ............................................................................................................

Step 1 - SuperPINDA sensor height adjustment 106 ..................................................

Step 2 - Finalising the assembly 106 ..............................................................................

Step 3 - Connecting the power supply 106 ...................................................................

Step 4 - Finalizing 107 .......................................................................................................

Step 5 - Printable 3D models 107 ....................................................................................

Step 6 - Prusa knowledge base 107 ................................................................................

Step 7 - It works! Reward yourself. 108 ..........................................................................

Step 8 - Join PrusaPrinters! 108 ......................................................................................

Original Prusa MINI+ kit assembly 5

1. Introduction

6Original Prusa MINI+ kit assembly

STEP 1 All the required tools are included

The kit includes:

The bag with tools is included in the YZ & X-AXIS box. Please prepare it now.

Allen keys including one TORX key

Needle-nose pliers (1x)

Universal wrench (1x)

No soldering is required.

No wire crimping is required.

STEP 2 Universal wrench - description

The universal wrench is designed

for tightening all these fasteners

used on the MINI+ printer:

1. Brass nut

2. M3nN nyloc nut

3. Brass nut

4. Nozzle

5. Heatbed spacer

1. Introduction

Original Prusa MINI+ kit assembly 7

STEP 3 Tools required for lubricating bearings

In some chapters there are

instructions for lubricating the

bearings before using them.

For these instructions, the kit

includes:

Prusa lubricant applicator (1x)

Prusa lubricant (1x)

STEP 4 Labels guide

All the boxes and bags including

parts for the build are labelled.

Each bag (or box) label describes in

which chapter you will need it.

1. Introduction

8Original Prusa MINI+ kit assembly

STEP 5 Use labels for reference

Most of the labels are scaled 1:1 and can be used to identify the part :-)

For the most common screws, nuts and PTFE tubes. You can also use the enclosed

letter, which contains Prusa Cheatsheet on the other side.

You can help.prusa3d.com/cheatsheet from our site. Print it at 100 %, don't rescale

it, otherwise, it won't work.

STEP 6 Spare bag

Every type of fastener is included in

a separate special bag.

If you lose a screw during assembly,

use one from this bag.

1. Introduction

Original Prusa MINI+ kit assembly 9

STEP 7 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.

STEP 8 We are here for you!

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

You can contact us using following channels:

Using comments under each step.

Using our 24/7 live chat at shop.prusa3d.com

Writing an email to [email protected]

1. Introduction

10 Original Prusa MINI+ kit assembly

STEP 9 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 while manipulating with it. Avoid touching

the chips, capacitors and other parts of the electronics.

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

neutralize any electro-static energy.

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

energy.

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

electricity. It is safer to wear cotton clothing.

1. Introduction

Original Prusa MINI+ kit assembly 11

STEP 10 Pro tip: inserting the nuts

3D printed parts are very precise, however, there still might be an occasional lack of

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

Therefore it might happen, that the nut won't fit in easily 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.

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.

Whenever you need to fit the nut that doesn't fit properly, we recommend using

"screw pulling technique". You will be reminded with Joe's avatar ;)

Parts in the pictures are used as an example.

STEP 11 Pro tip: inserting the square nuts

Always check the correct position of the M3nS nuts in the printed parts

immediately after insertion. Improperly inserted nuts will not allow proper assembly

of parts.

Make sure the nut is inserted all the way in. Use the following methods:

Use a 2.0mm Allen key for easier insertion into the hole.

Check the hole alignment by using a 2.0mm Allen key.

Check visually if the hole in the nut is aligned with the hole in the printed part.

1. Introduction

12 Original Prusa MINI+ kit assembly

STEP 12 Reward yourself

Building the MINI+ printer is a

challenge unlike any other and you

should reward yourself for every

milestone you reach. That is why a

bag of Haribo Bears is included!

The biggest issue from the

previous builds (MK3S+, SL1)

which we had to address was

inadequate bear consumption.

Many of you didn't have enough

bears for all chapters, some even

ate them all before they started!

After completing each chapter or

challenging section of the chapter,

you will be prompted to replenish

energy for the following steps.

Don't eat all the bears before you

start or at once! Not following

instructions will have serious

consequences, we are currently

assembling Prusa Haribo tactical

squad for this matter.

Hide the Haribo for now! From our

experience, an unattended bag with

sweets tends to suddenly

disappear. We are still investigating

this phenomenon.

All information provided in this step

is based on a long-term very serious

research study ;)

1. Introduction

Original Prusa MINI+ kit assembly 13

STEP 13 How to successfully finish the assembly

To successfully finish the assembly please complete each of the following:

Always read all the instructions at the current step first. This 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 can 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.

Eat the gummy bears as instructed! Disobedience won't be tolerated :D

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

partners. However, we take no responsibility for possible fights ;)

Ready for more? Let's move to the next chapter: 2. YZ - axis assembly

14 Original Prusa MINI+ kit assembly

2. YZ - axis assembly

Original Prusa MINI+ kit assembly 15

STEP 1 Tools necessary for this chapter

For this chapter please prepare:

2.0mm Allen key

2.5mm Allen key

3.0mm Allen key

Needle-nose pliers

Universal wrench

STEP 2 Y-carriage: parts preparation

All the printed parts and fasteners

needed for this chapter are included

in the box: YZ & X-axis

For the following steps, please

prepare:

Y-carriage (1x)

M3nN nyloc nut (6x)

M3x10r screw (6x)

Bearing clip (3x)

Linear bearing LM8UU (3x)

included in the

Rods

package

The list continues in the next step...

2. YZ - axis assembly

16 Original Prusa MINI+ kit assembly

STEP 3 Y-carriage: parts preparation (lubricating)

For the following steps, please prepare:

Prusa lubricant applicator (1x)

Prusa lubricant (1x)

Several paper towels to wipe oil and grease from the bearing surface.

Each bearing must be lubricated before mounting on the printer. Follow these

instructions carefully.

STEP 4 Lubricating the bearing

Use any piece of fabric as a pad to protect your working surface from grease.

Make sure the bearing is clean inside.

Wipe the preservative oil off the bearing surface with a paper towel.

It is necessary to lubricate all 4 rows of balls inside the bearing.

Open the lubricant and pierce the hole in the tube with the tip in the cap.

Screw the tube into the applicator.

Carefully slide the entire bearing onto the applicator.

2. YZ - axis assembly

Original Prusa MINI+ kit assembly 17

STEP 5 Lubricating the bearing

Turn the tube and applicator clockwise until you feel a slight resistance. This

means that the holes in the applicator are aligned with the ball rows.

Gently press the tube to push the lubricant into the ball rows of the bearing.

Look at the front of the bearing. When the applicator pushes the lubricant out

(around the black gasket), stop pressing the tube. Hold the bearing with the other

hand during the lubricating.

The grease must be spread evenly over all four ball rows inside the bearing. There

must not be too much grease, or too little. Take a closer look at the last picture.

Wipe off excess grease on the outside of the bearing with a paper towel.

Use this procedure for all three bearings.

Do not remove the applicator from the tube. Keep it prepared for the next chapter.

The bearings may leave excess grease on the smooth rods after their installation.

Wipe off any residue with a paper towel.

STEP 6 Correct bearing orientation

The correct orientation: When placing bearings onto the Y-carriage, make sure

that they are oriented as shown in both pictures. The tracks (rows of balls) have to

be on the sides.

The incorrect orientation: Avoid placing the bearing like in the last picture! This

orientation with a single row of balls in the center of the hole will later increase the

wear of the smooth rod, possibly creating a groove in it.

2. YZ - axis assembly

18 Original Prusa MINI+ kit assembly

STEP 7 Installing bearings on the Y-carriage

Insert linear bearing in the center of the cutout. It doesn't matter which side. The

top side and bottom side are the same.

Place the bearing clip over the bearing.

Insert two M3x10r screws into the holes in the bearing clip.

Using your fingers, hold the heads of both screws and turn the Y-carriage. Place the

nyloc nuts on both screws.

Tighten both nuts by using the 2 mm Allen key and the universal wrench.

Repeat these steps for the remaining two linear bearings.

STEP 8 Heatbed spacers: parts preparation

For the following steps, please prepare:

Heatbed spacer (9x)

M3x8 screw (9x)

MINI-Y-belt-holder (1x)

M3x12 screw (2x)

2. YZ - axis assembly

Original Prusa MINI+ kit assembly 19

STEP 9 Installing the heatbed spacers

Insert the M3x8 screw from the bottom of the Y-carriage (the side with bearings).

Screw the heatbed spacer onto the screw from the top side of the Y-carriage and

tighten it with the universal wrench and 2.5mm Allen key.

Use this procedure for all 9 heatbed spacers.

Place the MINI-Y-belt-holder on the bottom side of the Y-carriage.

Orient the holder so that the side with the teeth faces the side with one bearing!!!

Double-check the MINI-Y-belt holder orientation!!!

Secure it with two M3x12 screws.

STEP 10 Y-axis front: parts preparation

For the following steps, please

prepare:

MINI-Y-plate-front (1x) with Original

Prusa MINI logo on the front

M5x20r (4x)

2. YZ - axis assembly

20 Original Prusa MINI+ kit assembly

STEP 11 Comparison of extrusions

Take all the extrusions and compare

their lengths.

You will need two shorter (262 mm)

extrusions for the Y-axis assembly.

STEP 12 Mounting the Y-plate-front

Place the short extrusion to the left "inner" side of the MINI-Y-plate-front. See the

protrusion on the plastic part. Do not place the extrusion directly on the protrusion

on the left. There must be a gap. See the picture.

Slide the extrusion onto the plastic part so that the protrusion fits in the extrusion.

Secure both parts with two M5x20r screws. When tightening the M5x20r screws,

push on the extrusion from above.

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