User:Virtlink/Prusa Mendel (iteration 2)/Bill of Materials
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This is the Bill Of Materials (BOM) for the Prusa Mendel i2.
It is consistent with the build instructions.
This includes:
- Greg's Hinged Accessible Extruder Carriage
- Bearing variants: ABS/PLA, LM8UU or LM8EUU
- Cold glass/mirror bed
- T2.5 timing belt
- Aluminium T2.5 pulleys
- ABS/PLA Z-axis couplings
- ABS/PLA bearing guides
This does not include:
- An electronics mount
For variations, please adjust the quantities you use accordingly. See below.
Contents
Printed parts
The files you need for the printed parts can be found in the PrusaMendel GitHub repository. Run generate-metric.bat (or one of the batch files for the linear bearings) and it'll generate all the STLs needed. You will need OpenSCAD installed and it will need to be in your path.
The following is a list of what needs to be printed:
Parts for Wade's extruder are also included with the iteration 2 STL's:
Quantity | STL file | Additional notes | |
---|---|---|---|
1 | wade.stl | ||
1 | wade-big.stl | ||
1 | wade-small.stl |
Other non-printed parts
The following parts can not be reproduced on a RepRap and have to be found elsewhere.
Part Name | Basic | Extruder | Additional notes | |
---|---|---|---|---|
M8 threaded rod, 210 mm | 2 | 0 | Z-axis lead screws. Can use 300 mm too. | |
M8 threaded rod, 294 mm | 4 | 0 | Front/rear frame. Can use 300 mm too. | |
M8 threaded rod, 370 mm | 6 | 0 | Triangle side frames. | |
M8 threaded rod, 440 mm | 3 | 0 | Top/bottom frame. Can use 450 mm too. | |
8 mm smooth rod, 350 mm | 2 | 0 | Z-axis. | |
8 mm smooth rod, 405 mm | 2 | 0 | Y-axis. | |
8 mm smooth rod, 420 mm | 2 | 0 | X-axis. | |
GT2 Timing Belt, 840 mm | 1 | 0 | Y-axis. You can use T2.5 if you want. GT2 is slightly better but less available and often pricier. Be sure to match pulleys. | |
GT2 Timing Belt, 900 mm | 1 | 0 | X-axis. You can use T2.5 if you want. GT2 is slightly better but less available and often pricier. Be sure to match pulleys. | |
Pulleys for GT2 belt, ~16 teeth | 2 | 0 | Can be 12 teeth, but 16-20 is advised for less backlash. Bore diameter should be 5 mm. | |
Vinyl tubing, OD: 6.35 mm, ID: 4.32 mm, L: 150 mm | 2 | 0 | Used to attach motors to the Z axis threaded rods. Can be found at most hardware stores, typically used in toilets to connect refill tube to outlet. | |
MDF 6mm thick (dimensions unknown) | 1 | 0 | Used as the bottom print bed. | |
Glass surface or mirror | 1 | 0 | Used as the top print bed. Small, cheap Ikea mirrors work well. | |
Bearing, round 608 | 3 | 3 | "6082RS" for sealed, "608ZZ" for shielded. Don't cut costs here. | |
Bearing, linear LM8UU/LME800 | 11 | 0 | Or 8 x 25mm brass bushings. Check the plastic parts: in some cases an extra linear bearing is required. If using linear bearings, don't cut costs here. Cheap ones can damage the smooth rods. | |
Hobbed bolt M8 | 0 | 1 | For bringing the filament down the nozzle. |
Basic metal parts
Part Name | Frame | Y-Axis | X-Axis | Z-Axis | X-Carriage | Print bed | Electronics | Extruder | Total | Additional notes |
---|---|---|---|---|---|---|---|---|---|---|
M3 10 mm Bolt | - | 3 | 8 | 8 | 4 | - | - | 3 | 26 | |
M3 25 mm Bolt | - | 4 | - | 8 | 4 | - | 3 | - | 19 | |
M3 40 mm Bolt | - | - | - | - | - | 4 | - | 3 | 7 | |
M3 Grub Screw | - | 1 | - | - | 1 | - | - | - | 2 | |
M3 Nut | - | 4 | 8 | 8 | 5 | 5a | 3 | 6 | 39 | |
M3 Washer | - | 8 | - | 20 | 8 | 16 | 6 | - | 58 | |
M4 20 mm Bolt | - | - | - | - | 2 | - | - | - | 2 | |
M4 Nut | - | - | - | - | 2 | - | - | - | 2 | |
M4 Washer | - | - | - | - | 2 | - | - | - | 2 | |
M8 Fender Washer 30mm | 4 | - | 2 | - | - | - | - | - | 6 | Used in assembly instructions, but not necessary if bearing-guide.stl is used instead. |
M8 Nut | 60 | - | 2 | 4 | - | - | - | 2 | 68 | Just buy a box of 100, spares are handy. Enough for Wade's extruder too. |
M8 Washer | 65 | - | 3 | - | - | - | - | 4 | 72 | Just buy a box of 100, spares are handy. Enough for Wade's extruder too. |
- a) Or nyloc nuts.
Electronics
Part Name | Frame | Y-Axis | X-Axis | Z-Axis | X-Carriage | Print bed | Electronics | Extruder | Total | Additional notes |
---|---|---|---|---|---|---|---|---|---|---|
NEMA 17 Stepper motor | 4 | 1 | More information on stepper motors and their recommended torque, see the Stepper motor page. | |||||||
Mechanical End Stop | 3 | |||||||||
RAMPS | ||||||||||
Arduino | ||||||||||
Stepper motor drivers | ||||||||||
Stepper motor driver heatsinks | ||||||||||
Thermistor | ||||||||||
Resistor |
Electronics
Stepper Motors
The Prusa iteration 2 uses 5 NEMA17 stepper motors, including the extruder. Two of these motors, the Z axis motors, are connected to the same stepper driver of the electronics. 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
About any RepRap controller works for the Prusa iteration 2. Required features: 4 stepper drivers, 1 thermistor input and 1 heater output for the extruder and optionally another thermistor/heater pair for the heated bed. Choosing the best one for your printer is mostly a matter of taste. For comparisons, see List of electronics, Comparison of Electronics and Alternative Electronics.
Extruder
Heated Bed
Tools and supplies
To build your Prusa, you'll require the following tools and supplies:
Name | Additional notes |
---|---|
Drill bit 8 mm | |
Drill bit 4 mm | |
Drill bit 3 mm | |
Drill | Handdrill or powerdrill. |
Open-end wrench 13 mm | You'll need two. A 0.5 inch open-end wrench might work too. |
Soldering iron | |
Solder | |
Screwdriver Philips head | |
Pencil | |
Calliper, 300 mm digital | A 150 mm calliper works too. |
Ruler 450 mm | Steel or aluminium. |
Wire stripper | |
Wire cutters | |
Zipties | About a dozen. |
Oil | Any loose viscosity oil should work just fine for the smooth rods and Z screw. For example, gun oil. |
Allen key 1.25 mm | For the grub screws. |
Allen key 3.00 mm | For the M4 bolts. |
The following tools and supplies are recommended:
Name | Additional notes |
---|---|
Wire wrap | |
Sigarette lighter | |
Kapton tape, 10 mm | |
Pocket knife | |
Pair of crimps | |
Organizer | For all the little parts. Preferably with removable compartments. |
Variations
Extruder
For a list of possible extruders, see Extruders.
= Printing bed
A heated bed usually yield higher quality finished builds with materials such as ABS and PLA, as it prevents warping. It also removes the need for printing on rafts.
Timing belt
The GT2 timing belts and pulleys seem to become the new norm.
Pulleys
Included in the GitHub Prusa i2 repository are STL files for ABS/PLA T5 pulleys. Both the T5 belt type and the use of ABS/PLA pulleys is no longer recommended. Whatever timing belt type you end up using, ensure your pulleys match.
Z-axis couplings
Some people prefer aluminium 5 mm to 8 mm Z-axis couplings, but others say they have a tendency to stretch.
Bearing guides
It is easier to use fender washers on each side of the 608 bearings instead of printing and glueing the ABS/PLA bearing guides. In this case, use an M8 30 mm fender washer, then a normal M8 washer, then the 608 bearing, then a normal M8 washer and then the M8 30 mm fender washer again.
Electronics mount
While you could easily make yourself a mount from MDF and secure it to the RepRap using zip ties, some prefer to print this ABS/PLA Electronics Mounting Plate for RAMPS and Printrboard.
Electronics
There are all kinds of alternatives to the default Arduino Mega and RAMPS 1.4 electronics. You can find them on the Alternative Electronics page.