Summary

The aqualung fins (in this case Phazer) use a 12mm rubber strap instead of a spring. Cute, but the pull tab for it is not very sturdy and it can break. I created these to replace one.

I printed in PLA-F, but I might do in PETG as well. It needs supports. Consider print it at 45 degrees to give more strength, but mine is functional as-is.