Direct Drive (Gearless) Extruder
by brnrd, published
I made two versions: One uses the MK7 pinch wheel and the other uses an M8 hobbled bolt that's been cut and drilled to mount on the motor shaft. The advantage of the smaller diameter 8mm bolt/rod is that it can apply more force to the filament.
It can surely go faster if 1.75 mm filament is used. The design for the hobbed bolt should work for 1.75 mm filament if a MK7 gear drive is used instead.
I've also included a 40 mm fan bracket.
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For those asking about whether you can extrude 3mm feed fast enough with a direct drive NEMA 17, the answer is yes. Paired with a good hot end like the J-Head Mk-V that requires little force, I can extrude up to 160 mm/s of 3mm ABS feed through a 0.35 mm nozzle using a drive that's around 6.5-7 mm diameter.
Yes. It's important to drill the hole in the center. You need a lathe. I think it can also be done with a drill press but it would require making it function like a vertical lathe.
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You'll need to either buy a MK7 pinch wheel. The better choice is to take an 8mm hobbed bolt, cut it, drill a 5 mm hole down the center and then tap across for a grub screw to fix it on the stepper motor shaft.
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