Prusa Mendel 3D Printer

Write By: wz9919 Published In: How to Created Date: 2014-08-12 Hits: 706 Comment: 0

Prusa Mendel 3D Printer

How to build RepRap Prusa Mendel


Quick Notes for Beginner: Here is what you need for a fully operational RepRap Prusa Mendel 3D Printer.

at A2APrinter


Complete Prusa Mendel Hardware Kit

Including: All bolts, nuts, ball bearing,threaded rod, smooth bar, belts
$91   Buy


Wade's Geared Extruder

Including: Complete Extruder Hardware Set - Pre-hobbed M8x50 bolt; M6 Brass Barrel; Brass Nozzle 0.5mm; NiChrome Wire; Thermistor NTC Glass 100K; PTFE Rod; Kapton Tape.
$54   Buy


Complete Prusa Mendel Plastic Printed Parts

Including: Complete Plasic Printed Parts, Wade's Gear Extruder Printed Parts.


Power Supply

Including: New PC Power supply
$29   Buy



Note: Here is the link for the Official Electronics
  $200 Buy



Note: Price : $18 each x 5pcs
$90   Buy


Thick Plate

Note: We have "3.5mm Aluminium Printed Plate for Prusa Mendel" in stock.
$26   Buy
    Total Cost

Bill of Materials

Note: This Bill of Materials is for an RepRap Prusa Mendel printer, with Wade's Geared Extruder.
Note: Prusa Mendel Visual Instructions: Web Page

Mechanical Construction - Buy  
3x 608ZZ Ball Bearing: Buy
T5 Belts: Buy
Bolts, Nuts, Washers Buy
8mm Diameter Bars Buy
M8 Thread Rod/Studding Buy
Wades's Geared Extruder  
Extruder Hardware Set Buy
M6 Brass Barrel Buy
Brass Nozzle 0.5mm Buy
NiChrome Wire Buy
Thermistor NTC Glass 100K Buy
PTFE Thermal Barrier Buy
High Quality Kapton Tape - 33m Long Buy
Printed Parts  
Plastics Kit Link
Power Supply  
Power Supply Buy
Official Electronics - Link  
Generation 3 Electronics/Tech Zone Remix Link
Sanguinololu Link
Ultimaker's v1.5.3 PCB Link
Monotronics Link
Pololu Electronics Link
Erik's_Ultimaker's_v1.1_PCB Link
Ultimaker RAMPS v1.3 PCB Link
Generation 6 Electronics Link
Generation 7 Electronics Link


  1. Getting Started
  2. Configuring the Axes
  3. Calibrating the Extruder
To calibrate, you will need the following: a RepRap, a Slide Caliper, and printing material (ABS, PLA, HDPE, etc).
You will also need a Cube object to print out.(Download Cube STL File | Thingiverse Page).
  1. Setup and load your printing material.
  2. Print the calibration object.
  3. Allow the object to cool.
  4. Use the slide caliper to measure each edge and the diagonals.
  5. Make a note of each measurement and this will allow you to determine where a problem is IF there is a problem.

With the above measurements, you should be able to determine any alignment issues. The sides should measure withing .5mm of 40mm. If it is off consistently, then it is probably a firmware issue.
Most inconsistent discrepancies are a sign of backlash (i.e. slop or play in your mechanical system). Make sure the grub screws on the pulleys are tight; make sure the belts are tensioned so that when you turn the stepper by hand, it immediately produces a movement in the axis; make sure all the bearings turn smoothly, and that the carriages only move along their intended axis. with all of that double checked, try printing your test piece again, and pay very close attention while it is printing. If your stepper motors make strange noises occasionally, it might be that they are skipping steps because they don't have enough torque. Try turning up the trim pot for that axis.
Once you get a simple cube printed adequately, you might consider trying a more difficult object such as the bearing clip 01 for more fine-tuning.

If all this fails, the best place to go to figure out how to fix your issue, once you've identified it, is either to ask someone in the forumsg or search on


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