This thing was modified with Tinkercad. Edit it online https://tinkercad.com/things/0fRAiZWZbJEThe Stubby Mini was made because I wanted interchangeability with the rings I printed, however on my Rep 2, one you put a ring-a-thing on, it STAYS on.This smaller version allows the ring to stay on tight, but still pop off with some force.Use a raft, it makes life easier when printing all ring sizes at once. TRUST.