SAE Prusa Mendel
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Release status: working
Description | SAE Prusa Mendel is an offshoot of Prusa Mendel.
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SAE Prusa mendel is an offshoot of the Prusa Mendel, only difference currently is it only uses 1 screw size (SAE #6 instead of metric M3 and M4), and only uses 608 bearings. Spacexula did the conversion, and is currently trying to maintain this branch.
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Contents
Development
The Prusa Mendel is on hosted 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
The SAE Prusa Mendel BOM is slightly different than Metric Prusa Mendel, but as close as possible.
(in works, not complete yet)
Printed Parts
Non-Printed Parts ("vitamins")
Quantity | Description | Type | Comments | Part Numbers |
---|---|---|---|---|
1 box (100) | 5/16" nuts | Fastener | 95462A030 (1 box) | |
1 box (100) | 5/16" washers | Fastener | 90126A030 (1 box) | |
1 box (100) | #6 washers | Fastener | 90126A509 (1 box) | |
1 box (100) | #6 1" screws | Fastener | 90272A153 (1 box) | |
1 box (100) | #6 nylock nuts | Fastener | 90631A007 (1 box) | |
1 box (100) | 5/16" Fender Washers | Fastener | 91090A111 (1 box) | |
3 | 608 Bearing Sets | Bearings | 5972K91 (?) | |
1 box (100) | M3x10 bolt | Fastener | Motor Mounting | 92005A120 (?) |
2280 mm ~90"/7.5' | Neoprene Belting .200" Pitch, 1/4" | Drive Belt | 7959K24 (?) | |
1 | 9 foot smooth rod (NOT GALVANIZED) | X,Y,Z bars | 8893K41 (3 foot sections, $4.30, no straightness spec, one arrived bent)
8888K41 (3 foot sections, $8.53, 0.005"/foot straight) both are +/-0.0005" and may bind on bronze bushings if oversize | |
1 | 21 foot threaded rod | Frame | 98841A030 (3 foot sections) | |
4 | 7/16" x ~1" springs | optional, or from a spring loaded pen | ||
1 | Wade's Geared Extruder | (or any other compatible extruder) | ||
5 | Nema 17 Stepper Motors | |||
1 | Standard Mendel electronics + endstops | This can be RAMPS, Pololu Electronics, Gen6, Gen3, or anything else compatible |
Aquiring Drive Belts
(No need to split belts, no continuous Z axis belt)
Belt 1- 870mm ~34.25"/ 2.8' Belt 2- 1410mm ~55.5"/ 4.7'
Aquiring Smooth Rod
Do not get Galvanized Rods, they are much rougher.
Use Standard Mendel lengths for cutting 495x2 406x2 and 330x2.
The smooth rod is cut into varying lengths, therefore, its common to aquire in 3 foot sections.
If you have 3x 3ft smooth rod 8893K41
Rod1: 495mm,330mm 19.5",13" 495mm seems too long on my build, try 5-7 cm shorter [-Bryan] Rod2: 495mm,330mm 19.5",13" Rod3: 406mm,406mm 16",16"
Aquiring Threaded Rod
The rods should be cut (by you) to the following sizes, in mm (the original sizes) or in inches for the SAE purist who wants to avoid little bits at the end.
To the right are "close enough" lengths in inches that will minimize number of cuts. (Note: Cut one of the threaded rod sets listed below, not all!)
If you have 3 ft lengths,
3' Rod1: 440mm,440mm 18",18" 3' Rod2: 440mm,370mm,50mm 18",15",2" 3' Rod3: 370mm,370mm 15",15" 3' Rod4: 370mm,294mm,210mm 15",12",9" 3' Rod5: 370mm,294mm,210mm 15",12",9" 3' Rod6: 294mm,294mm 12",12" 3' Rod7: 370mm 15"
At Lowes in some towns you can get 4 ft length allowing you to combine Rod7 and 3 into 1, 4 foot rod, or you could use 3 four foot lengths and 2 three foot lengths for a less wasteful (and probably cheaper) set as follows:
3' Rod1: 440mm,440mm 18",18" 3' Rod2: 440mm,370mm,50mm 18",15",2" 4' Rod3: 370mm,370mm 15",15",15" 4' Rod4: 370mm,294mm,210mm 15",12",9",12" 4' Rod5: 370mm,294mm,210mm 15",12",9",12"
At Menards or Ace Hardware you can get 6 ft rods. You can use three of them as follows:
6' Rod1: 440mm,440mm,440mm,370mm,50mm 18",18",18",15",2+" 6' Rod2: 370mm,370mm,370mm,370mm,294mm 15",15",15",15",12" 6' Rod3: 370mm,294mm,294mm,294mm,210mm,210mm 15",12",12",12",9",9" + extra
About the Electronics
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].
Where To Purchase
See the Mendel Buyers Guide for information on where to purchase all of the parts needed.
Printed Parts
Printing a Prusa on a Mendel
An easier option then individually printing each part if you are printing Prusa on a RepRap Mendel is the pre-assembled build file containing the Prusa parts. With this option you only need to print the Mendel plate and the PLA bushings to get a complete Prusa Mendel:
- SAE Mendel Plate (contains all printed parts except the PLA Bushings)
- SAE PLA Bushing
Printing a Prusa on a CupCake CNC
There are also pre-assembled build files available to fit your CupCake CNC's build area (download using right click => save as)
Note:
- These plates are 85x95mm in size.
Plates for the MakerBot (The plates have changed, these print times are no longer accurate):
- SAE Makerbot Plate 1=> 6 hrs 30 min
- SAE Makerbot Plate 2=> ~2 hrs 30 min (needs retesting)
- SAE Makerbot Plate 3=> 5 hrs 40 min
- SAE Makerbot Plate 4=> 2 hrs 30 min
- SAE Makerbot Plate 5 => 1 hr 50 min
Printing a Prusa on anything else
Last but not least, if you have a machine that doesn't fit into any of the previous options all the .stl files necessary to print a Prusa Mendel are available on the PrusaMendel Github where you can download them and print them individually.
Buy the printed parts
Mendel_Buyers_Guide#RepRapped_Parts_Kits
Assembly
Assembly of an SAE Prusa Mendel should proceed in exactly the same order as the original Prusa Mendel. Consult the Prusa Mendel Assembly Guide for more information.
Media
- Two printers simultaneously - Prusa and shaper cube working side by side.
- Prusa homing using enstops
- Prusa development overview
- Prusa Y axis stress test
- Prusa Z axis stress test
- Early preview of the Prusa Mendel redesign
See Also
- PLA bushings
- SAE Mendel
- [2] MrJohn's cost breakdown