Fleshlight ring insert. Narrower neck with flexing pressure points
thingiverse
Inspired from 5137504. This makes for a massive improvement. I printed this in PETG and it is a little fragile because it's designed to flex, but, the flex is a big part of what makes it great and it's completely durable in use for me. The initial ring is a narrowed down neck and the ovals on arm extensions grip but have give. They are intentionally slightly uneven and line up well with insert ribs. You won't regret it. PLA is probably too rigid to flex right compared to PETG.
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