Bolt filament feeder
by gringer, published
Recent Commentsview all
@ronthomp You're not really giving me a chance to see things from your point of view. Could you please confirm that the design I pointed to is the one you were referring to when you mentioned "the original Reprap design"?
That's actually a problem with my current feeder (which uses a custom knurled bolt), because the filament already wants to twist -- I wonder if the bolt was cut using some mechanism that encouraged twisting. Looking at the filament when it comes out of the threader (I bought a reprap with a bowden cable), you can clearly see that the filament is slipping when the desire to twist (or not) exceeds the insistence of the bolt to continue on straight (or twist).
I'm hoping that using the normal bolt thread will reduce this issue. In my current hand-driven tests, I've had no problem so far with slipping due to twisting.
Give a Shout Out
Still to model:
- brackets for mounting to hot end, stepper motor
- joiner to connect stepper motor to bolt head
I got frustrated with the extruder feeder clogging up with bits of PLA, so had a think about what other mechanisms I could use to feed the filament, preferably without the need for purchasing extra metal parts. This is my first attempt at something a little different that feeds the filament directly beside the bolt, using the bolt thread to push the filament.
- M8 thread depths were taken from newmantools.com/tech/threadm.htm
- added 0.25mm to circle radiuses to account for extrusion width
- modified enclosure (hopefully a near-final design) to hold full length of bolt and support brackets
The openSCAD file has variables for almost all the things you might want to adjust. In particular, bolt/screw length, bolt/screw diameter, and filament diameter.
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