Prusa Mendel (iteration 2)

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Prusa Mendel Documentation

Introduction

The Prusa Mendel Iteration 2 is an improvement of the Prusa Mendel, and was released in November 2011

Main improvements

The following is a list of the main improvements made on the original Prusa

  • More parts are made to be push-fit
  • The carriages accommodate bushings and linear bearings
  • Nut traps were added to parts that were attached with M3 screws (e.g. endstop holders etc.)
  • The second bed plate was removed (The PCB heatbed is the second plate)
  • The belts were changed to T2.5 belts - it is recommended to buy professional belt pulleys
  • Most M4 screws were changed to M3s
  • A printed plastic belt guide was designed to replace the large M8x30 fender washers
  • The belt clamp was redesigned

Development

The development of the Prusa Mendel is hosted on github: http://github.com/prusajr/PrusaMendel.

History

Printed Parts

Quantity STL file Picture
1 wade.stl I2-wade.png
1 wade-big.stl I2-wade-big.png
1 wade-small.stl I2-wade-small.png

Non-printed parts

Derived from parts list by Kliment

Quantity Description Comments
Fasteners
100 M8 nut Easier to buy a box of 100, spares are handy. Enough for Wade's extruder too
100 M8 washer Easier to buy a box of 100, spares are handy. Enough for Wade's extruder too
50 M3×20 bolt Enough for Wade's extruder too
50 M3 nut Enough for Wade's extruder too
50 M3 washer Enough for Wade's extruder too
6 M3x10 bolt
2 M3x8 grub screw
1 M8x50 grub screw
Bearings
10 LM8UU (Asia) or LME8UU (US, Europe) linear bearings OR
8mmx25mm brass bushings
If using linear bearings, don't cut costs here. Cheap ones can damage the smooth rods.
3 608 "roller skate" bearings "608RS" for sealed, "608ZZ" for shielded. Again, don't skimp.
Rods - can all be cut from 6 1m lengths of M8 threaded rod
6 370mm M8 threaded rod Three per side
4 294mm M8 threaded rod Front/rear. Can use 300mm too
3 440mm M8 threaded rod Top/Bottom. Can use 450m too
2 210mm M8 threaded rod z-axis lead screws. Can use 300mm too
6 405mm M8 smooth rod
Belts
1 840mm GT2 toothed belt T2.5 can be used as well. Be sure to match the pulleys.
If you really want you can use T5 but it's not advised.
1 1380mm GT2 toothed belt T2.5 can be used as well. Be sure to match the pulleys.
If you really want you can use T5 but it's not advised.
2 16-tooth pulleys to fit GT2 belts Can be 12-tooth, but 16 is advised for less backlash. Bore diameter should be 5mm.


If using Wade's extruder as included in the STLs:

Quantity Description Comments
Fasteners
4 M8 washers Included in count above
2 M8 nuts Included in count above
6 M3 nuts Included in count above
3 M3x10 bolts
3 M3x40 bolts
1 M3x8 grub screw
1 M8x20 grub screw
1 M8 hobbed bolt
Bearings
3 608 "roller skate" bearings "608RS" for sealed, "608ZZ" for shielded.

Electronics

Stepper Motors

The Prusa iteration 2 uses 5 NEMA17 stepper motors, including the extruder. If using Wade's Extruder, its stepper motor needs a minimum holding torque of 40Ncm (0.4Nm). More information can be found on the Stepper Motor page

Controller Electronics

There are many controllers available to use for the Prusa iteration 2. Choosing the best one for your printer is up to you. It's probably best to head over to Comparison_of_Electronics and choose the best one for you. The most popular tend to be RAMPS or Sanguinololu.