NEW VERSION (old files removed)

Designed in FreeCAD, source file attached. Feel free to tweak. Open for constructive comments, but this version is after learning better workflow in Free CAD.

Printed with a generic TPU, I think about 39grams. I used a 205deg nozzle, lower than the spool recommends, but it works for me. And a 50deg plate. Again, just what worked for me. I also always use a brim, not a skirt. However, that leaves a slightly rough edge around the base when the brim is removed.

Be sure to thoroughly remove the supports to get the best fit. TPU supports are tough to remove, especially in this design. You'll see!