Ultimaker Stock Large feeder gear

by Lampbus, published

Ultimaker Stock Large feeder gear by Lampbus Sep 13, 2012

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Drop in replacement for Mk2 / Mk3 ultimaker 3mm filament feeder.
Wheel2 is my first version.
Wheel3 has larger holes and a support cylinder in the center.


I printed at 0.2mm using my Ultimaker and Cura.
Used gold PLA at 210degreesC

Derived the gear+holes from MoonCactus and added the 3mm thick hex boss to replace the washer used in the wooden version. The boss clamps between the hex nut and 'acorn' nut so the gear dosn't wobble like the wood one. (I am using the Mk 3 knurled drive : https://shop.ultimaker.com/en/parts-and-upgrades/knurled-bolt-kit-version-3.html )

I printed 'wheel2' without support and the centre 8mm hole took a few layers to form properly and needed tidying with a knife - try with cura's support option, or print 'wheel3' and snap out the support cylinder after print.

This gear runs better than the wood one - possibly because it is slightly smaller diameter accross the teeth tips - the teeth root diameter is the same as the wooden ultimaker laser cut unit. I havn't checked the STL/Scad data, but it could just be due to the rounding of the tips by the filament process.

The small laser cut plastic gear has small root radi as a result of the laser process, whereas the wood large gear has sharp tooth tips. They seem to have been designed witout any root clearance, which is not advised for this reason (and others)!

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Not quite the thing for me…
It's a little too thick, so it doesen't actually fit well. You have to use washers anyways, since It will touch the bolts otherways. Or did I get this wrong with the washers?
The other thing is, that the holes don't fit for adjusting the stepper motor, which is actually a quite important thing.

It's nice to be able to screw the feeder wheel tight. But my gear is still tilted quite a bit, at an angle to the rod. I wonder why. Maybe the uneven material that dropped from Cura's not-very-successful bridging attempt is tilting it? Or is one of the screw/nut/acorn tilted by design? Does anyone else have this problem?

Hmm, I did post a reply, but it disapeared...
Anyway, I have uploaded 'Wheel3' which has a support core to snap off after build...