Ultimaker retraction ring
by JelleAtProtospace, published
This is a variation of the extruder wedge thingies that keep the drive-end clamp taught. Most of these are not easy removable, something you want to do when doing multicolered prints or just for switching filament. This one can be undone by a simple twist and slide. On the low side you have enough room to undo the bowden tube. It does not come loose easily and because it is ring shaped you will not lose it because one of uncaring/sloppy collegues/users.
Note: I do not, will not and am unable to give any more rights than the selected license: CC-NC-SA. Specifically: no extra rights to thingiverse, whatever your silly T&C tries to claim.
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1) print out, I used 0.2 layer height. 2) remove filament. 3) remove bowden cable from drive 4) remove grippy insert thing from clamp 5) push grippy thing through ring and back into clamp 6) insert bowden tube back in clamp 7) ... 8) Profit! (no more lost extruder wedges)