This is an enlarged version of my other model. It fits larger bag rolls up to 37 mm (1.4") in diameter by 60 mm (2.4") long. Easy to print and even includes a little strap to tie the bag dispenser to the dog's leash.

If you have any issues with the inner threads, just print at a higher layer density like 0.08 mm. In my experience, I've had no issues at 0.12 mm but I have small issues at 0.2 mm.