I needed a Bow Sander to help smooth out the slot of one of my prints. I came up with this guy to do to trick.
Takes a ~12mm wide strip of sand paper and stretches it across the curved bow. Ends are held in place by removable, snap-in cylinders that have a lever arm that can be used to help press in or cantilever out.
2 walls, 4 top and bottom
I used brims to keep the 2l and 2r parts upright during printing.