Wombot Drafter User manual

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Personal 3D Printer
Kit Assembly Manual

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Contents of This Manual
Section Page
Introduction 3
Tools Required 4
How to use this Manual 5
Section Assembly Sequence Page
Part 1 Printer Frame 6
Part 2 Y Axis Assembly & Heated Bed 12
Part 3 Extruder Module 22
Part 4 Z Axis Assembly 33
Part 5 Motherboard Enclosure & Saddles 35
Part 6 X Axis Assembly 36
Part 7 LCD Control Module 46
Part 8 Wiring 47
Part 9 Finishing Touches 60
Part 10 Powering Up & Initial Tests 65
Part 11 Component Listing / B.o.M 67
Part 12 Recommended Spare Parts List 70

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Introduction
Thank you for purchasing the Wombot Drafter Kit. We hope it brings you many hours of
learning, enjoyment and reliable service. Please read this assembly manual fully before
beginning assembly of your Drafter and ensure that you understand every step of the
assembly process. Every care has been taken to ensure that you have a complete kit of
components which will enable to you complete assemby however should you find anything
missing or damaged in transit, please contact us at suppor[email protected]m.au to request
replacements. Please note that support for the Wombot Drafter Kit is limited to this
instructional manual, email services and online tutorials. Because of the nature of this
product, telephone support is not practical.
Health & Safety
Your health and safety are important to us and should be your top priority always. Please
take care while assembling your kit, take your time and be careful when using hand tools
and while handling the components used to assemble your printer. Personal safety is
ultimately your responsibility. Please ensure that your workspace is clean, tidy and free of any
safety hazards prior to beginning the assembly of your Wombot Drafter. Please take care
when using sharp tools or handling aluminium extrusion pieces – they can have sharp edges.
During use, please also keep in mind that 3D Printers have two main areas which can reach
high temperatures – the heated bed which can sustain 110 degrees Celsius, and the
Nozzle/Hot End/Extruder, which is designed to operate at a maximum of 250 degrees Celsius.
Instant and serious burns can result from contact with the skin. Please also ensure that your
Drafter is situated in a safe place away from the reach of children and household pets during
operation. Once you have completed the assembly of your Wombot Drafter, please also
familiarise yourself with the User Manual before attempting to print for the first time as it
contains useful information on how to calibrate and operate your Drafter as well as
troubleshooting information.
Assembly Sequence Overview
The assembly of your Wombot Drafter needs to take place in the sequence outlined in this
manual so that each step is completed correctly and in order. This will allow you to get your
kit assembled in the shortest possible time and reduce the chances that you will have to
disassemble the printer later to repeat an important missed step or critical component. This
applies especially to the sliding nuts used throughout the frame assembly because once
assembled, sliding nuts cannot be fitted later without disassembling the whole frame.
Please take the time to read each step carefully before beginning assembly to make sure
that you understand the requirements of each module and that the required components
have been laid out on your workspace along with the appropriate tools.

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Tools Required to complete your Wombot Drafter
All components required to complete assembly are included with your Wombot Drafter Kit.
You will also require some basic hand tools and equipment as follows:

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How to use this manual
This manual contains a great deal of detailed information about how to assemble your
Wombot Drafter and about 3D Printers and 3D Printing in general. It is laid out in a logical,
methodical order with written descriptions in non-technical terms and is fully illustrated with
high quality colour images so that you can see exactly what you are aiming for with each
step. Please read this manual from front to back before commencing assembly to familiarize
yourself with each section of the build and the components required.
3D Printers are a fantastic way of bringing to life your ideas and creative inspirations as well
as an extremely useful tool for creating practical everyday objects, from that hard-to-get
replacement part on your clothes dryer to a fully functional radio-controlled quad-copter
frame, however they are extremely mechanically dependent on measurements being
correct during assembly and require a great deal of attention to detail in order to achieve
optimal results. For this reason, we have highlighted areas of critical importance, either
because there is a safety concern, a particular way of doing something, or a helpful tip to
assist in assembly.
These items of importance are highlighted throughout this manual as follows:
ATTENTION: Pay Particular Attention during assembly.
Helpful Tip: Suggestions and Instructions to assist you in the correct
assembly of your Drafter to save time and avoid possible problems
later.
CAUTION: Hot Surface when in use – Please exercise extreme care.
CAUTION: Pinch Hazzard – do not touch while in use.
PARALLEL / PERPENDICULAR: Please take extra special care to make
sure that the indicated components are fitted parallel or
perpendicular to one another as required.

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Part 1 - Printer Frame
In your kit of parts, locate the following items:
ITEM DESCRIPTION QTY
1 3030 INTERNAL R/A BRACKET 10
2 CHASSIS RAIL/GANTRY RAIL 3030 BLACK x 340mm 3
3 LEFT/RIGHT CHASSIS RAIL 3030 BLACK x 410mm 2
4 M6 GRUB SCREW 4
5 M6 x 10MM HEX HEAD CAP SCREW 16
6 SLIDING NUT M5 SYSTEM 30 16
7 VERTICAL RAIL 3030 BLACK x 470mm 2
Prepare the Internal Right-Angle Brackets as per the following Images.
x2 PIECES x8 PIECES
Lay out your Extrusions on a flat surface and assemble your pre-prepared brackets as per the
following images. Tighten the Screws and Grub screws making sure that the vertical rail is
perpendicular to the base rail:
Repeat this process so that you have two identical side frame assemblies.
Set these two frames aside for the moment.

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Lay out your remaining 3 extrusion pieces and load the Sliding Nuts as per the following
images:

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Arrange your frame rails as per the attached images ready to be slotted together and
fasteners tightened:
VIEW FROM FRONT OF FRAME
VIEW FROM REAR OF FRAME

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Slide the internal corner brackets into the ends of the extrusions and slot the frame together
so that it matches the following image and gently tighten all the bolts in place:
Now slide the remaining 4 M5 Sliding nuts into the sides of the vertical rails as indicated by the
green arrows in the following images:

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Complete the frame assembly by fitting the final piece of 3030 Extrusion – the Top Gantry Rail
to the top of the frame using the last two internal brackets as per the following images:
When fastening the Top Gantry Rail in place, please make sure that the two vertical rails are
parallel to one another. This can be achieved by measuring the distance between them at
the base, and comparing it to the distance at the top. They should be the same. If they are
not, loosen the appropriate bolts on the internal right angle brackets and adjust as required
to achieve the same measurement between the vertical rails, from top to bottom.

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Once complete, your frame should look like this:
All joints where the extrusion meets with another piece of extrusion should be a
flush joint where the end of one piece of extrusion lines up perfectly with the side
of the piece it is mated to, as per these images:
This completes the Printer Frame Assembly section of the manual. Please set the
frame aside for the moment and proceed to the next section.

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Part 2 - Y Axis Assembly & Heated Bed
In your kit of parts, locate the following items:
ITEM DESCRIPTION QTY
1 ALUMINIUM BED TROLLEY 1
2 GT2 Y BELT BLOCK 1
3 M3 X 12mm HEX HEAD SCREW 1
4 M3 x 35mm HEX HEAD SCREW 1
5 M3 FLAT WASHER 2
6 M3 NUT NYLOC 2
7 8MM BEARING BLOCK 2
8 M4 x 8mm HEX HEAD SCREW 8
9 SMOOTH ROD 390mm LENGTH 2
10 Y ROD BRACKET 4
11 M5 x 16mm HEX HEAD SCREW 4
12 M5 FLAT WASHER 4
Fit the GT2 Y Belt Block to the underside of the Aluminium Bed Trolley using the M3 Bolts,
Washers and Nyloc Nuts as well as the 8mm Bearing Blocks using the M4 Bolts as per the
following images paying particular attention to the orientation of the block in relation to the
mounting holes in the trolley:
Take a moment to double check the tightness of the bolts holding the bearing blocks and
GT2 Belt Block in place. They must be tight in order to avoid any slop in the Y Axis. Also
double check that there are no sharp edges remaining on the Bed Trolley.
Lay the Y Axis Bed Assembly down on it’s face with the bearing blocks and Belt Block facing
upward. With a clean cloth, wipe down the two 8mm Smooth Rods to ensure that there is no
debris present and that they are in good clean condition. Gently feed each of the smooth
rods through the bearing blocks and fit a Y Rod Bracket to each end of both rods, as per the
following image:

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The Y Rod Brackets are designed and 3D Printed to be a snug fit on the 8mm smooth rods
deliberately to ensure that there is no movement or slop in the bracket once assembled. We
have checked these before putting them in your kit however it may be necessary to use an
8mm drill bit to clean the hole to achieve the correct fit.
Place the assembled Y Axis Trolley onto the base of your frame as per the below images and
fasten the brackets to the frame loosely (do not tighten, only fit the screws, they will be
tightened later when setting the final position of the bed trolley and heated bed assembly)
using the M5 X 16mm screws and M5 washers. Pay particular attention to the orientation of
the Bed Trolley and the two small holes in the rear left of the plate as noted with the green
arrow – they will be used later to harness the wiring from the heated bed. Also make sure that
when fitting the Y Axis assembly to the frame, that you use the outer-most sliding nuts. Leave
the sliding nuts between the brackets in place for later use by the Y Motor and Y Idler:

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In your kit of parts, locate the following items:
ITEM DESCRIPTION QTY
1 Y IDLER BRACKET 1
2 M3 x 25mm HEX HEAD SCREW 1
3 M3 FLAT WASHER 2
4 M3 NUT NYLOC 1
5 IDLER GT2 16 TOOTH 3mm ID 1
6 M5 X 16mm HEX HEAD SCREW 2
7 M5 FLAT WASHER 2
8 M6 FLAT WASHER 2
Your Y Idler Bracket comes with the Y End stop micro switch already fitted and terminated. All
you need to do is to place the GT2 Idler Pulley into the slot and secure it with the M3
Fasteners with a washer under the bolt head and the nut. Please do not over-tighten. You
only need to bring the nut up to the surface of the washer – the bolt should still be able to
spin freely when you are finished – all we need to do here is to engage the nylon locking ring
within the Nyloc Nut.

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Using the remaining M5 Bolts and M5 Flat Washers, fit the completed Y Idler bracket to the
rear of the base frame loosely, using the remaining 2 Sliding Nuts between the Bed Assembly
Brackets you fitted earlier. Place the two M6 Flat Washers between the Y Idler Assembly and
the Rear Frame to act as a support and flat surface for the idler to rest against:
In your kit of parts, locate the following items:
ITEM DESCRIPTION QTY
1 Y MOTOR BRACKET 1
2 STEPPER MOTOR NEMA 17 1
3 M3 x 10mm HEX HEAD SCREW 3
4 M3 FLAT WASHER 3
5 M5 x 12mm HEX HEAD SCREW 2
6 M5 FLAT WASHER 2
7 PULLEY GT2 20 TOOTH 5mm ID 1
Place the Nema 17 stepper motor flat on your work space and fit the Y Motor Bracket into
place. Fasten it with the 3 M3 Bolts and Flat washers paying particular attention to the
orientation of the bracket to the motor connector:

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Now fit the 20 Tooth Pulley to the shaft of the motor, paying particular attention to the gap of
2mm between the bottom of the pulley and the bracket and the location of the FLAT section
on the shaft of the motor. One of the two grub screws in the pulley MUST be aligned with this
flat when tightened.
Using the remaining two M5 Screws and Flat Washers, fit the completed Y Motor assembly to
the front rail of the Printer Frame Loosely using the remaining two sliding nuts in the frame as
per the below image:

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It is now time to fit the Y Axis (Bed) Belt System, set the final positions of the Bed Rails, Y Motor
and Y Idler and fit the Heated Bed Assembly. Please carefully note the dimensions in the
following images – You can always adjust later to fine tune the alignment, but we
recommend beginning with these dimensions and distances.
In your kit of parts, locate the following items:
ITEM DESCRIPTION QTY
1 BELT GT2 6mm WIDTH 1
2 GT2 BELT TENSION SPRING 1
3 HEATED BED WOMBOT 255mm X 255mm 1
4 M3 x 20MM COUNTERSUNK SCREW 4
5 M3 NUT NYLOC 8
6 COIL SPRING 4
7 SPIRAL WRAP BLACK 400mm 1
8 CABLE TIE 2.5mm X 100mm 3
Place your printer frame on it’s side so that you can access the underneath of the frame and
fit the Y Axis GT2 Belt and GT2 Spring. Make a loop with the GT2 Belt and slot it into the Y Block
as per the following image:
Run the belt along the bed, pass it through the Y Motor (around the pulley) and back
towards the Y Idler. Pass the Belt around the Y Idler pulley and back towards the Y Belt block.
Make a loop and press fit the belt into the matching cavity in the Y Block as per the following
images:

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The Belt does not need to be pulled tight before insertion into the Block – remember that the
Y Motor and Y Idler modules are still loose and must be tightened later – this will remove the
slack in the belt at a later stage as will the GT2 Belt Tension Spring.
Now that the Y Trolley, Y Motor, Y Idler and Y Belt are fitted, turn your printer frame over so
that it is sitting flat on your bench. We are now going to adjust and tighten the Y Axis Smooth
Rod Mounts, Y Motor and Y Idler into their final positions. Please note the dimensions and
alignment in the following images so that everything is in the correct position to provide the
correct build volume and so that smooth, unobstructed linear travel is achieved for the Y Axis
(build plate):
Measure and locate the front left Y Rod Bracket so that there is 95mm between the inside of
the base frame and the outermost surface of the left side smooth rod. Tighten the Y Rod
Bracket while pushing down on it to lock it in place flat to the frame base. Repeat the
process for the other end of this rod, at the rear of the frame with the same 95mm distance
so that the smooth rod is parallel with the base frame.
Turn your frame over so that you can access the underside of the machine. Gently slide the
bed trolley back and forth and while doing so, slide the Y Motor and Y Idler into position so
that the belt is aligned perfectly straight and parallel to the smooth rod on the left-hand side
of the base frame as per the following images (you can temporarily rest the frame on two of
your stepper motors to achieve full travel on the Bed Trolley to assist in correct alignment):

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Once you are satisfied that the belt Y Motor, Y Idler and Belt are in alignment with the travel
of the Y Bed Trolley, you can proceed to gently tighten the Y Motor and Y Idler into position
on the frame. Do Not Over-Tighten.
Now you can proceed to tighten the Right-Hand Side Smooth Rod Brackets into place. To do
this – Slide the Bed Trolley all the way towards the bracket you are tightening. Gently push
the Y Rod bracket away from the centre of the machine (green arrow) so that it travels
0.5mm and tighten mounting bolt while under tension (red arrow).
Repeat for the bracket at the other end of the Rod. We do this so that there is a very slight
tension between the linear bearing and smooth rod which will ensure a snug fit and minimize
play/slop in the travel of the Bed Carriage during printing.
You can check the correct position of the Y Rod Brackets by sliding the Bed Trolley to the
centre of travel and gently twisting and rocking it to check for play or excessive movement. If
excessive play is present, repeat the previous step and move the Y Rod Bracket outward an
additional 0.25mm until accurate, slop free travel is achieved along the full travel of the bed.

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Now you can proceed to fit the GT2 Belt Tension Spring to the Y Axis Belt.
Lay the frame on it’s side so that you can move the Bed Trolley forward and backward freely.
Move the Bed Trolley all the way to the rear of the machine and place the spring on the belt
as close to the Y Motor as possible without it making contact with the Y Motor Pulley as per
the following image:
Now it is time to fit the Heated Bed to the Bed Trolley.
Fit the M3 x 20mm Countersunk Screws to the Heated Bed, locking them in place using M3
Nyloc Nuts as per the below images: