The problem of all sanding paper blocks is tension. My make is solving this problem. Hope it'll be usefull for smb.
Pls be careful while assembling the tool. Put every part inside another until you hear “click” sound. (use video)
If you want to change paper or tension - pull the cap for 3 mm. Adjust, then press it back. Then turn CW slightly.
PETG is perfect. Print crown with hi res and 100% filling. Other parts can be printed 15%.
Video -
The author marked this model as their own original creation.