Round Sander for Guitar and Curved Surfaces

thingiverse

These are some round sanding blocks useful for sanding inside curves on guitars. The sandpaper gets tucked into the slot, wrapped around the holder and then you push both ends inwards together until it's taught. There is space for the sandpaper to curl up in if you didn't trim it short enough so I recommend trimming your paper a bit longer than you think you need it to be to be safe. I used some peel and stick neoprene rubber to provide some padding.