5/29/19 UPDATE: Still using the same case I printed months ago. Showing people that I created my own phone case is always a great conversational piece.
UPDATE: Printed this case in TPU at .2mm and it came out perfectly. No pictures yet because I'm waiting for some white TPU for better contrast against my black phone. Also going to print it at .1mm to completely eliminate layer lines. This is by far my favorite printable phone case. Prints like a dream, fits like a glove.
Remix of the case by Scotty with the slits closed for printing with TPU. Someone else did this already, but the model had weird shapes around where he patched the slits up. I wanted it to be perfect, so I gave it a shot. Not a designer, but I tried my best with MeshMixer. Currently printing, so I don't know if it'll work or not, but I'm 99% sure it will. GCODE preview looked fine.
EDIT: Simplify3D DOES NOT LIKE THIS MODEL AND I DO NOT KNOW WHY. Cura slices it just fine, so that's what I used.
3D Solutech TPU