From Thingiverse:
https://www.thingiverse.com/thing:2552573
Stoma / Ostomy Guard
by munrafd September 25, 2017
This is a guard that can be attached to an ostomy bag using some adhesive tape or velcro tape. Feel free to size it however you need. It helps protect a stoma from your belt, or seatbelt without protruding out too much. No supports needed to print.