User:Cisox
Contents
Prusa Mendel
Main Body
Printed Parts
Quantity | Description | Type | Comments | Diagram |
---|---|---|---|---|
2 | coupling | RP | coupling.stl | |
3 | endstop-holder | RP | endstop-holder.stl | |
1 | x-carriage | RP | x-carriage.stl | |
1 | x-end-idler | RP | x-end-idler.stl | |
1 | x-end-motor | RP | x-end-motor.stl | |
1 | y-motor-bracket | RP | y-motor-bracket.stl | |
2 | z-motor-mount | RP | z-motor-mount.stl | |
4 | belt-clamp | RP | belt-clamp.stl | |
8 | bar-clamp | RP | bar-clamp.stl | |
2 | rod-clamp | RP | rod-clamp.stl | |
2 | pulley | RP | pulley.stl | |
4 | frame-vertex with foot | RP | frame-vertex-without-foot.stl | |
2 | frame-vertex | RP | frame-vertex-with-foot.stl | |
12 | pla-bushing | RP-PLA | pla-bushing.stl. Check the file, it makes either 4 or 12 |
- All printed parts consolidated into mendelplate.stl and pla-bushing.stl.
Non-Printed Parts ("vitamins")
Quantity | Description | Type | Comments |
---|---|---|---|
Required | |||
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. |
6 | M8×30 mudguard / fender washer | Fastener | |
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 | |
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 or A2 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 | |
1 | 840mm×5mm T5 pitch timing belt | Belt | Y axis |
1 | 900mm×5mm T5 pitch timing belt | Belt | X axis |
4 | NEMA 17 bipolar stepper motors | Stepper | Be sure to get ones with at least 20mm of shaft length. Shorter shafts require modifications to the X pulley assembly and Z motor couplers. |
50 | small cable binder / ziptie | Misc | |
3 | Mechanical endstop switches | Switch | Endstops are either optical switches or mechanical switches (Recommended), You need one for each of the X, Y, Z axes. |
Optional | |||
3 | 30mm×10mm Optoflags | Thin Sheet | Ff using optical endstops instead of mechanical endstops |
2 | 8mm ID spring | Spring | to eliminate backlash in the z axis |
1 | object with precisely 290mm length | for frame alignment | |
1 | object with precisely 234mm length | for frame alignment |
Note: You can combine the latter two by having a piece of thick sheet with dimensions 290mm×234mm. Make sure to mark which side is which.
Threaded Rod Cut Order (when cutting from 1m lengths):
Required: 6x1m Long 8mm Threaded Rods (or 5x1m pieces + 1x50cm piece) Rod 1: 370mm, 370mm, 210mm, ~50mm (The last piece will end up somewhat shorter than 50mm. ) Rod 2: 370mm, 370mm, 210mm, ~50mm ( Use it for your idler. Alternatively, an M8x30 or ) Rod 3: 370mm, 294mm, 294mm, ~42mm ( longer bolt can be used. ) Rod 4: 370mm, 294mm, 294mm, ~42mm Rod 5: 440mm, 440mm, ~120mm Rod 6: 440mm
Smooth Rod Cut Order (when cutting from 1m lengths):
Required: 3x1m Long 8mm Smooth Stainless Steel Rod Rod 1: 420mm, 420mm Rod 2: 406mm, 406mm Rod 3: 350mm, 350mm
The Prusa Mendel uses the 4 drivers in the standard Mendel electronics package to drive 5 motors by using two steppers wired in parallel to one driver [1].
Extruder
- The following extruder is Wade's Geared Extruder for 3mm filament. For 1.75mm filament use RepRap Universal Mini Extruder; or any other compatible extruder for either.
Printed Parts
Quantity | Description | Type | Comments | Diagram |
---|---|---|---|---|
1 | extruder block | RP | M8_Extruder_Block_3.stl | |
1 | extruder idler block | RP | M8_Extruder_Idler_Block_2.stl | 50px |
1 | ? | RP | 11t17p.stl | 50px |
1 | ? | RP | 39t17p.stl | 50px |
Non-Printed Parts
Quantity | Description | Type | Comments |
---|---|---|---|
Feeder | |||
2 | 608 bearings, skateboard bearings | Bearings | |
1 | M8X50 bolt | Fastener | to be hobbed, M8x60 has a longer smooth part, allows a second lock-nut, and may be easier to find |
1 | M8 nut | Fastener | Nyloc works better, but a pair of nuts will also work |
4-5 | M8 washers | Fastener | to space the large gear clear of the motor retaining bolt heads |
Idler | |||
1 | 608 bearing, skateboard bearing | Bearings | |
1 | (M)8X20 | Threaded rod | |
4 | M4X60 or M4X45 hex head bolts | Fastener | Hex head will work best (they won't turn), and longer than 45 mm will be easier to assemble if you can find them. |
4 | M4 nuts | Fastener | typically wing nuts |
8 | M4 washers | Fastener | |
4 | ~4mm ID springs | Spring | Sized to fit over an M4 bolt, unsprung length of 10-12mm, each spring providing 25-35N load. For a given filament drive force, you'll need about twice the spring force - i.e., if you want 100N of filament drive, your springs need to push with about 50N each. |
16 | M4 washers | Fastener | optional; 4 washers on each M4X45 idler bolt between the main block and the idler block will limit the idler travel and make reloading filament easier. |
NOTE: Some users have their extruders working without springs, but springs are recommended. A good source for these springs is in the cloth-cabinet on spring loaded skirt-hangers or trouser-hangers. Just cut the right length off the springs. | |||
Hot End Mount | |||
2 | M3X35 bolts | Fastener | |
4 | M3 washers | Fastener | |
2 | M3 nuts | Fastener | |
1 | 2.5mm drill | See section Hot End | |
Stepper Motor Mount | |||
3 | M3X10 bolts | Fastener | Low profile bolt heads might work better here |
3 | M3 washers | Fastener | |
1 | M3 grub screw | Fastener | To secure the pulley, ideally 8mm long, but anything 6mm+ should be fine |
1 | M3 nut | Fastener | To secure the pulley |
Stepper Motor | |||
1 | NEMA 17 bipolar stepper motors | Stepper | 5 kg*cm works well; Kysan 42BYGH4803 is what I used. Should be capable of creating a holding torque of at least 40Ncm, at the very least. |
Extruder Mount | |||
2 | M4X20 bolts | Fastener | |
2 | M4 nuts | Fastener | |
2 | M4 washers | Fastener |
Electronics
- This can be RAMPS, Sanguinololu, Gen6, Gen7, Gen3, or any other Mendel compatible electronics.