Ring Cleaner V2

Instructions for printing:

1. You have to print it in TPU. That way, you can slightly press the ring and it will be kept in place no matter its size.
2. Print with 0% infill and 3 walls. Sweet spot between flexibility to keep the ring in place and stiffness to prevent bending while cleaning.
3. Print the part of the model that goes inside the drill with 100% infill so it won't be squished when tightened. 

Works like a charm.

Previous versions:

In previous versions I tried with PLA, but the printing orientation made it easy to break due to poor layer adhesion so I split the model in half to print it sideways and then join the halves, but the seam isn't clean and changes the diameters. Besides, the discreet increments in diameters meant the fit with the ring had to be perfect. TPU is certainly the way to go.