Summary

Got this inspiration for a Trash Bag Roll Holder browsing through Thingiverse.
This is my very first design, I used Microsoft 3D Builder to design it.
You can scale it to fit your Roll size.
Fixed it with a Tesa Power Strip to the inside of a closet.
You might need to rotate it for a propper print, print it the way as it would be used later on.
No supports needed.