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I printed pit3k's bowden clamp and I experienced some difficulties to pass the filament through the riser. I made a subtle change on the riser hole which guides the filament through on the nut part. Now the nut has a conical hole and just 5 mm before the top it extends to fit the tightening ring into it.
I also made a countersink on the bottom on the riser after the print by using a countersink tool (I tried to create this countersink directly in the model but it fails to print on a heated bed, even when raft was switched on).
I also recommend to do another countersink on you bowden tube too.
Finally, I printed chopmeister's great H3 feeder unit and tried to install this bowden clamp in it. It was OK, except that the riser was a bit loose so I made a small tightening nut too to fix this.
Modified OpenSCAD source attached.
To explain what I did I made a simple drawing - check the picture.
I printed it with 0.1mm layer height, 100% infill.
Update #20130329: the hole for the bowden tube on the top was too short and also the thread was not long enough if you wanted to use the tightening nut. I extended the thread by 5 extra millimeters and created a new STL (Feeder Clamp 5mm longer thread) and also increased the size of the bowden tube hole by a little in both Feeder Clamp STL files.
Feeder Clamp with Conical filament driver by fns720 is licensed under the Creative Commons - Attribution - Share Alike license.
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