Thingiverse
BCN3D Sigma Bowden Creep Fixer by kirberich
by Thingiverse
Last crawled date: 3 years ago
Some BCN3D sigmas suffer from bowden tube creep - there are already a lot of shims that fix this happening due to retraction, but on my sigma it happened additionally because of rotation of the bowden tube in its fitting.
This simple mod fixes both issues. Simply print both files, heat up the extruder, remove the bowden tube, loosen the extruder screws, slide in the bowden holder, put the bowden tube in, retighten the extruder screws, add a cable tie as tightly as you can, and slide in the anti-backlash shim.
To remove the tube from the extruder, just remove the shim and loosen the extruder screws slightly. You should be able to pull out the tube with a bit of force (holding the bowden fitting's collar down) and then slide the holder out from under the extruder screws.
I've got a small redesign in mind that should make removal simpler, but for me it seems fine the way it is.
This simple mod fixes both issues. Simply print both files, heat up the extruder, remove the bowden tube, loosen the extruder screws, slide in the bowden holder, put the bowden tube in, retighten the extruder screws, add a cable tie as tightly as you can, and slide in the anti-backlash shim.
To remove the tube from the extruder, just remove the shim and loosen the extruder screws slightly. You should be able to pull out the tube with a bit of force (holding the bowden fitting's collar down) and then slide the holder out from under the extruder screws.
I've got a small redesign in mind that should make removal simpler, but for me it seems fine the way it is.
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