What size sand paper strips does it use?

Thank you a lot for sharing it. I printed it and I found some things I would like to ask, curiosity. Why the thread, the screw works the other way arraund? it tight counterclockwise, is it on purpose? Why the head of the screw is so big, I would like to put the palm of my hand there when sanding, would be great to make the head smaller or countersunk. Ok it printed perfectly well, and I will use it, but wanted to know what I mention. Again. Thank you

printed fine, but thread is not strong enough, an additional winding may help.

worked well, i would scale it up but the design is solid

This works perfectly as expected. I did a little bit more wall amounts, just because sometimes screws get a little weird. but it holds sand paper fantastically