Geeetech Prusa I3 A pro User manual

Assembly Instructions of Geeetech Prusa I3 A pro
(Version 04-11-2016)

CONTENT
Safety Instructions ............................................................................................................................3
Preparation........................................................................................................................................4
1. Unfold the box and check the package..........................................................................................1
2. Assemble Y axis............................................................................................................................1
3. Build the printing platform .........................................................................................................11
4. Assemble Y smooth rods.............................................................................................................12
5. Mount the Y-axis belt..................................................................................................................13
6. Assemble the Z-axis stepper motor, bottom mount and couplings..............................................13
7. Assemble Y - Z axis ....................................................................................................................16
8. Attach the heated bed..................................................................................................................17
9. Mount the extension board..........................................................................................................18
10. Assemble the left end of the X axis（motor end).....................................................................19
11.Assemble the right end of the X axis. (X idler end)..................................................................26
12. Assembly of the extruder carriage.............................................................................................28
13. Assemble the X&Z axis............................................................................................................30
14. Assemble the Z axis top mount.................................................................................................32
15. X belt driving wheel..................................................................................................................33
16. Add the belt...............................................................................................................................37
17. Mount the extruder....................................................................................................................39
18. Mount the endstop of Y and Z axis...........................................................................................40
19. Wiring .......................................................................................................................................42
20. Mount the filament spool..........................................................................................................49
21. Arrange the wires and tidy them up with the coil. ....................................................................51
22. Tips............................................................................................................................................51

Safety Instructions
Building the printer will require a certain amount of physical dexterity, common
sense and a thorough understanding of what you are doing. We have provided this
detailed instruction to help you assemble it easily.
However ultimately we cannot be responsible for your health and safety whilst
building or operating the printer, with that in mind be sure you are confident with
what you are doing prior to commencing with building or buying. Read the entire
manual to enable you to make an informed decision.
Building and operating involves electricity, so all necessary precautions should
be taken and adhered to, the printer runs on 12V supplied by a certified power supply,
so you shouldn’t ever have to get involved with anything over 12V but bear in mind
there can still be high currents involved and even at 12V they shouldn’t be taken
lightly.
High temperatures are involved with 3D Printing, the Extrusion nozzle of the hot
end can run about 230°C, the heated bed runs 110°C and the molten plastic extruded
will initially be at around 200°C, so special care and attention should be made when
handling these parts of the printer during operation.
We wouldn’t recommend leaving your printer running unattended, or at least
until you are confident to do so. We cannot be held responsible for any loss, damage,
threat, hurt or other negligent result from either building or using the printer.

Preparation
1. Unpack the kit and check if all parts are in the box and check the condition of each
part, there might be some damage during shipping. To help you with this, there is
BOM in the box and each bag was labeled with part number.
2. Contact our customer service immediately by email or through the website if you
find any missing or damaged parts. And on the bottom of the BOM, there is a
signature of reviewer, please take a picture of it and attach the picture in your mail.
3. Read through each chapter of these instructions to gain an over-all idea of what is
involved and how long it might take, before starting on the work described.
4. Before you start, you can put all the part in order to save your time especially those
screws and nuts. Do not mix them up.
5. Ensure you have the necessary skills to carry out the work, or enlist the help of
someone who does.
6. Work on a big firm table or bench in a clean dry well-lit area.
7. This kit contains tiny parts; please keep them away from kids under 3.
8. Ask for help if you run into any problems - our contact details are on the website
and we will always do our best to resolve any problems encountered.

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1. Unfold the box and check the package
Unfold the package and take all the parts out to check the condition of the items. As
you can see, all the parts are packed very carefully.
Tips:
1. Before assembly, you are advised to put all the parts, especially the screws and nuts
in order, which will save you a lot of time looking for the required parts.
2. The part ID is corresponding to the number labeled on the bag of every part.Some
parts may not have label, you can refer to the pictures on the package list.
For step by step video instruction, please refer to the video. (Some require parts used in
the video may differ from this instruction; please refer to this manual as a priority)
2. Assemble Y axis
2.1Assemble the 2 threaded rods.
VIDEO
Pic
Part ID
Required
number
Required parts
NO.5
2
Y threaded rod
NO.A10
2
connecting plate
NO.10
6
Spring washer
NO.9
8
M10 washer
NO.13
8
M10 nut
Thread the nuts and washers into the two M10 threaded rods separately. The orders
should be:

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2.2Attach the front and rear side support plates of the rods.
VIDEO
Slide assembled threaded rods into the support plates. Screw up the rods and plates
with 4 M10 nuts and M10 washers.
* Tips: The Y-axis must be a rectangle, that is the rods on both side should be parallel,
so is the front and rear plate. Otherwise it will cause obstruction for the belt later.
2.3Assemble the Y idler
VIDEO
Note: as the driving wheel was added later, so in the video, there is some difference from what you
get. But do not worry; it won’t affect the whole process.
Pic
Part ID
Required number
Required parts
NO.36
2
Ball bearing
Pic
Part ID
Required
number
Required parts
NO. A2
1
Front Side Support
NO.A3
1
Rear Side Support
NO.9
4
M10 washer
NO.13
4
M10 nut

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NO.37
1
bearing holder
NO.38
1
Driving wheel
NO.14
1
M4 lock nut
NO.A8
1
Guide Block
A
NO.A9
1
Guide Block
B
NO.24
3
M3 x 25screw
NO.28
1
M4x25 screw
NO.15
1
M3 wing nut
NO.7
3
M3 washer
NO.8
2
M4 washer
Step1. Amount guide block A and B onto the front support plate together, screw up it
with 2 M3x25 screws and M3washers.

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Note: the guide block B is close to front support plate.
Step2. Thread a M3 x25screw and M3washer through the bearing holder.

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Step3. Insert the two MR84zz ball bearings into both ends of the driving wheel. You
will need use some force to do this.

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Step4. Put the M4 x25 screw and M4 washer through the driving wheel. Lock the
other end with a M4 lock nut. You may need a wrench to tighten locking nut. If the
holder is too tight, you need to open it a bit.

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*Do not screw it too tight, you should leave enough room for the wheel to turn freely.
Step5. Mount the assembled bearing holder through the guide blocks onto the front
support plates. And screw it with a wing nut. (You can also mount it later when
assembling the belt)
*Please leave enough room for the belt between the ball bearing and the screw.
2.4Mount the Y motor
VIDEO
Pic
Part ID
Required number
Required parts
NO. A7
1
Y motor fixed plate

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NO.54
1
Stepper motor
NO.41
1
pulley
NO.21
5
M3 x 10screw
NO.7
5
M3 washer
The pulley is changed but it will not affect the assembly and use. So some picture is
not updated.
Step1. Mount the pulley on the motor shaft, one of the screws should be screwed on
the cross section of the shaft. Screw it up tightly.
Step2. Insert the motor block into the slot; you may need to use a little strength to do
this. Then screw the motor on the Y motor fix plate with 3 M3 x 10 screws and
M3washers
Step3. Fix the block plate with 2 M3 x 10 screws and M3 washers.

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(In the video, I use the M3x16mm screw at this step; you can use either of them)
3. Build the printing platform
VIDEO
Pic
Part ID
Required
number
Required parts
NO.A6
1
Y building
platform
NO.39
1
Y belt mount

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NO.33
4
PCS8UU linear
bearing
NO.21
2
M3 x 10 screw
NO.27
16
M4x12 screw
NO.7
18
M3washer
NO.8
16
M4 washer
NO.12
16
M4 hex nut
Step1. Mount the belt mount at the middle of the platform with 2 M3 x 10 screws and
M3washers.
Step2. Mount the 4 PCS8UU linear bearing on the platform with 16 M4x12 screws
and M4 hex nut on the same side with the beltmount.
*In the video, I used the SCS8UU, but now we have updated the SCS8UU into PCS8UU to
lighten the load of the building platform, so the assembly will be a bit different, you need to use
hex nut to fix the bearing.
4. Assemble Y smooth rods
VIDEO
Pic
Part ID
Required number
Required parts
NO.3
2
Y smooth rod
NO.30
4
Lock screw
M3x4 mm
Thread two smooth rods through: front side support [A2]> linear bearings > rear side
support [A3] respectively. And fix the smooth rods with 4 lock screws.

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*When threading the rod, please make sure the holes are aligned and do not force it,
or you will break the balls in the bearings.
5. Mount the Y-axis belt
VIDEO
Pic
Part ID
Required number
Required parts
NO.42
1
Timing belt
NO.20
2
M3 x 8 screw
NO.7
2
M3 washer
Step1. Punch a hole on one end of the belt（the hole can be as the diameter of the M3
screw, leave enough margin ）
Step2. Fix the belt on one side of the belt -mount with a M3 x 8 screw and washer.
Step3. Guide the belt around the pulley on the motor and the Y idler.
Step4. Punch a hole on the other end of the belt and fix it on the belt -mount with a
M3 x 8 screw and M3 washer.
*Tips:
1.Before you drill your second hole, make sure to pull belt tightly to make sure to find
proper placement of hole for a tight belt, if it is too loose, it will hinder the move of t
he print platform.
2. Loosen the Y idler wing nut when tightening belt onto the Y belt mount, in order to
make securing the belt to the block easier. Be sure to tighten wing nut fully once done.
6.Assemble the Z-axis stepper motor, bottom mount and couplings

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VIDEO
Pic
Part ID
Required number
Required parts
NO.A1
1
X-Z frame
NO. A4
2
Z Motor fixed plate
NO.54
2
Stepper Motor
NO.40
2
Coupling
NO.22
4
M3 x 16screw
NO.21
8
M3x10 screw
NO.7
12
M3 washer
Step1. Mount the motor on Z Motor fixed plate, screw it with 4 M3x10screws and M3
washers.
Step2. Thread the wires of the motors through the hole at the bottom of the X-Z frame.
Mount the assembled motor to the X-Z frame (A1), and screw the X-Z frame and the
Z Motor fixed platewith 4 M3 x 16screws and M3washers.

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Step3. Mount the coupling on the motor shaft, one of the screws should be screwed on
the flat side of the shaft (As the picture shows). Screw it as tightly as possible.

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Step4. Repeat the above steps for another Z axis motor.
7. Assemble Y - Z axis
VIDEO
Pic
Part ID
Required number
Required parts
NO.22
4
M3 x 16 screw
NO.7
4
M3 washer
Step1. Held upright the X-Z frame on the threaded rods (Right after the Y connecting
plate)
Step2. Screw up the main frame to the Y connecting plate with 4 M3 x16 screws and
M3 washers.