I had better luck with a beefed up collett design. A little more material for post-processing and better walls. Thicker walls between holes (see below). Small bevel to start tube in.
Also, I found the best way to print these reliably is with a draft shield (or surrounded by the other parts).
STEP and STL attached
RubberBandCollet beefier v2.zip
Original
thicker walls
I had better luck with a beefed up collett design. A little more material for post-processing and better walls. Thicker walls between holes (see below). Small bevel to start tube in.
Also, I found the best way to print these reliably is with a draft shield (or surrounded by the other parts).
STEP and STL attached
RubberBandCollet beefier v2.zip
Original
thicker walls
