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We are starting a project to build and maintain a 3D printer. At the moment we are discussing which model we will focus on. Here are some options:


RepRap Prusa Mendel (Taken from Wikimedia user Julianh72)
Model: Mendel
Version: Prusa

The RepRap seems to be a promising, affordable and flexible, adaptable candidate. Especially the RepRap Prusa Mendel seems to be well suited for a Hackerspace. It costs between 450€ and 800€ as a ready set and probably less than 200€ if we get the parts locally.

The parts needed for the Prusa Mendel are almost entirely standard parts that can be found in almost any hardware store. These are mostly M8 thread rods, M8 screws and nuts, standard skateboard bearings, the common NEMA 17 stepper motor.

Here's a list of the parts needed (taken from the RepRap Wiki)

Printed Parts

Quantity Description Type Comments Printed
2 coupling RP stl[[1]] none
3 endstop-holder RP stl[[2]] none
1 x-carriage RP stl[[3]] none
1 x-end-idler RP stl[[4]] none
1 x-end-motor RP stl[[5]] none
1 y-motor-bracket RP none
2 z-motor-mount RP stl[[6]] none
4 belt-clamp RP stl[[7]] none
8 bar-clamp RP none
2 rod-clamp RP none
2 pulley RP none
4 frame-vertex with foot RP none
2 frame-vertex RP none
12 pla-bushing RP-PLA check your build file, the file makes either 4 or 12 none

Non-printed parts:

Quantity Description Type Comments Available?
83 M8 nut Fastener Buy a 100-pack to be on the safe side.
93 M8 washer Fastener Buy a 100-pack to be on the safe side. (Grade 2 works fine.)
6 M8×30 mudguard / fender washer Fastener These are also known as penny washers, they have a much larger outer diameter than regular washers.
2 M4×20 bolt Fastener To mount the extruder
2 M4 nut Fastener To mount the extruder
2 M4 washer Fastener To mount the extruder
2 M3x8 screw Fastener Anything 6mm or longer should do. Even M3×10 bolts will do the job.
22 M3×10 bolt Fastener
8 M3×20 bolt Fastener The M3x25 bolts are too long for the recent Prusa z-motor-holder, rod-clamp, and couplings.
8 M3×25 bolt Fastener
4 M3×40 bolt Fastener
70 M3 washer Fastener
40 M3 nut Fastener 8 optionally locknut / stop nut / nyloc
3 608 (roller/inline skateboard) Bearings Standard wheel bearings.
4 ballpoint pen springs Spring To fit over M3 bolts. About 25mm long and compress to about 10mm.
6 M8×370mm Threaded rod 3 per side - Can be cut from larger 6x1m pieces (see Threaded Rod Cut Order below).
4 M8×294mm Threaded rod front / rear
3 M8×440mm Threaded rod top / bottom
2 M8×210mm Threaded rod Z-leadscrew
1 M8×50mm Threaded rod or M8x30 or longer bolt for X idler. Take care: if the bolt is too long, it may not be threaded along a sufficient length
2 8mm×420mm Smooth rod X-bar - 304 Stainless Steel, A2 Tool Steel, or O1 Tool Steel are recommended for smooth rods as it can help to prevent friction from rust and manufacturing (straightness) standards are higher. Rust issues can be prevented on the normal steel rods by maintaining a coat of oil. The smooth rods can also be cut from larger 3x1m pieces (see Smooth Rod Cut Order below).
2 8mm×406mm Smooth rod Y-bar
2 8mm×350mm Smooth rod Z-bar
1 225mm×225mm print top plate Thick Sheet
1 140mm×225mm print bottom plate Thick Sheet Note: The Prusa Iteration 2 design does not use a print bottom plate.
1 840mm×5mm T5 pitch timing belt Belt Y axis
1 900mm×5mm T5 pitch timing belt Belt X axis
5 NEMA 17 bipolar stepper motor Stepper At least 20mm of shaft length. One should have a torque of < 40Ncm.
50 small cable binder / ziptie Misc
1 Wade's Geared Extruder for 1.75mm filament RepRap Universal Mini Extruder; or any other compatible extruder for either
1 Electronics + endstops This can be RAMPS, Sanguinololu, Generation 6 Electronics, Generation 7 Electronics, Generation 3 Electronics, or any other Mendel compatible electronics. End-stops are either optical switches or micro-switches (Recommended), and you need three, one for each of the X, Y, Z axes.

Extruder (Print-head)