Hey! This thing is still a Work in Progress.
Files, instructions, and other stuff might change!
Wiley's Extruder
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Published on December 29, 2012
Description
An experimental two-high spring dampened reversing roller cold end for a Bowden cable system. Uses modified Tetrix spur gears and axle hardware. Filament enters and exits on a 30 degree angle to assist in better hose curvature. Uses spring dampening system to allow deviations in the 3mm plastic filament diameter with an adjustable bottom out feature for decreased potential slippage. No bearings or moving plastic componentry.
Instructions
UPDATE: First prototype made; needed extensive modification/machining for assembly+operation. Need to modify design to remove extra machining steps.
Still in preliminary testing. For all I know this design might not work. Will update page once prototype is manufactured and tested.
BOM
1x extrudermotorside.stl (file is created with inch measurements)
1x extruderbushingside.stl (file is created with inch measurements)
1x NEMA 17
4x M3x10 SHCS bolt
8x 6-32-0.5" SHCS bolt
5x 1-4 UNF-1.5" SHCS bolt
5x 1-4 UNF Hex nut
2x compression springs (specs TBA)
2x 1/8 NPT pipe tap push-fit connector
1x Tetrix flat shaft axle
- tetrixrobotics.com/Building_System/Downloads/default.aspx?moid=677
2x Tetrix brass axle bushing
- tetrixrobotics.com/Building_System/Downloads/default.aspx?moid=701
1x Tetrix brass axle bushing (bored to NEMA 17 shaft dia.)
2x Tetrix 40t spur gear (machined out center grove for 3mm plastic filament)
- tetrixrobotics.com/Building_System/Downloads/default.aspx?moid=694
1x Tetrix axle shaft coupling
- tetrixrobotics.com/Building_System/Downloads/default.aspx?moid=700
1x Tetrix axle shaft coupling (bored to NEMA 17 shaft dia.)
Still in preliminary testing. For all I know this design might not work. Will update page once prototype is manufactured and tested.
BOM
1x extrudermotorside.stl (file is created with inch measurements)
1x extruderbushingside.stl (file is created with inch measurements)
1x NEMA 17
4x M3x10 SHCS bolt
8x 6-32-0.5" SHCS bolt
5x 1-4 UNF-1.5" SHCS bolt
5x 1-4 UNF Hex nut
2x compression springs (specs TBA)
2x 1/8 NPT pipe tap push-fit connector
1x Tetrix flat shaft axle
- tetrixrobotics.com/Building_System/Downloads/default.aspx?moid=677
2x Tetrix brass axle bushing
- tetrixrobotics.com/Building_System/Downloads/default.aspx?moid=701
1x Tetrix brass axle bushing (bored to NEMA 17 shaft dia.)
2x Tetrix 40t spur gear (machined out center grove for 3mm plastic filament)
- tetrixrobotics.com/Building_System/Downloads/default.aspx?moid=694
1x Tetrix axle shaft coupling
- tetrixrobotics.com/Building_System/Downloads/default.aspx?moid=700
1x Tetrix axle shaft coupling (bored to NEMA 17 shaft dia.)
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It definitely looks nice. How's it working?
Thanks! It's looking promising, yet has an issue with retraction/extrusion rates. I need to spend some more time working the kinks out; I just haven't found the time yet. I will post pictures to my flickr when I do. http://www.flickr.com/photos/w...