Prusa Mendel
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Release status: working
| Description | Prusa Mendel is a simpler remix of normal Mendel.
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- If you are building this machine using SAE (imperial) fasteners, see also SAE Prusa Mendel.
Contents
Introduction
Prusa Mendel is the Ford Model T of 3D printers.
Like the Model T, the Prusa Mendel improves on a previous design by being more streamlined for manufacture. The Prusa Mendel is a simpler remix of the original Mendel. By default, it uses printed bushings instead of regular bearings, though options to substitute inexpensive lm8uu linear bearings or other types of bearings or bushings are available. The current version uses three 608 bearings in total, one for the X axis and two for the Y axis. The 624 bearings are gone altogether.
Prusa's main goal is to be the purest and simplest 3D printer you can build.
- It's much simpler to build it.
- It's much simpler to modify it.
- It's much simpler to print it for your friends.
- It's much simpler to repair it.
Because of its complexity, the Prusa Mendel can be a living thing. I update it all the time. It's a unique feature but it should be standard. We are living in feature, we don't care if it's a bit different every time; our printer will print it in same time ;-)
Specifications
- Printed Parts: 45 (extruder drive included?)
- Non-Printed Parts: 388
- Cost: ???
- Print Volume: 200mm x 200mm x 100mm (8.2" x 8.2" x 4.1")
Video Clip
Development
The development of the Prusa Mendel is hosted on github: http://github.com/prusajr/PrusaMendel.
You can follow the changes on Changelog.
You can sign up for github for free and fork the project to begin working on it.
History
Bill of Materials
Printed Parts
| Quantity | Description | Type | Comments | Diagram |
|---|---|---|---|---|
| 2 | coupling | RP | stl[[1]] | 
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| 3 | endstop-holder | RP | stl[[2]] | 
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| 1 | x-carriage | RP | stl[[3]] | 
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| 1 | x-end-idler | RP | stl[[4]] | 
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| 1 | x-end-motor | RP | stl[[5]] | 
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| 1 | y-motor-bracket | RP | 
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| 2 | z-motor-mount | RP | stl[[6]] | 
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| 4 | belt-clamp | RP | stl[[7]] | 
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| 8 | bar-clamp | RP | 
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| 2 | rod-clamp | RP | 
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| 2 | pulley | RP | 
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| 4 | frame-vertex with foot | RP | 
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| 2 | frame-vertex | RP | 
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| 12 | pla-bushing | RP-PLA | check your build file, the file makes either 4 or 12 | 
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Non-Printed Parts ("vitamins")
Note that additional parts are required for the extruder, although some extruder parts are included in the table below.
| Quantity | Description | Type | Comments |
|---|---|---|---|
| 83 | M8 nut | Fastener | Buy a 100-pack to be on the safe side. 
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| 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 |
| 22 | M3×10 bolt | Fastener | |
| 16 | M3×25 bolt | Fastener | Or eight M3×25 bolt plus eight M3x20 bolts. The M3x25 bolts are too long for the recent Prusa z-motor-holder and rod-clamp, and also for the Z motor couplings. See Section 8, steps 4 and 13 for details. |
| 4 | M3×40 bolt | Fastener | |
| 70 | M3 washer | Fastener | |
| 40 | M3 nut | Fastener | 8 optionally locknut / stop nut / nyloc |
| 2 | M3 grub screw / set screw | Fastener | M3x8 seems about ideal but anything 6mm or longer should do. If these are hard to get, additional M3×10 bolts will do the job instead. |
| 3 | 608 roller skate / inline skate / skateboard bearing | Bearings | You don't need to ask for a "608 bearing" at a skate shop, just ask for wheel bearings. |
| 4 | ballpoint pen springs | Spring | To fit over M3 bolts. Ballpoint pens are a common, cheap source of suitable springs. They are about 25mm long and compress to about 10mm. |
| 6 | M8×370mm | Threaded rod | 3 per side Note: The threaded rods 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 Note: 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 | 1380mm×5mm T5 pitch timing belt | Belt | |
| 5 | NEMA 17 bipolar stepper motor | Motor | |
| 50 | small cable binder / ziptie | Consumables | or other cable management |
| 10 | 8mm Linear Bearings - LMU88 | Bearings |
