Sanding block for Circular Sock Knitting Machine collar

This is a very simple model I created to help me sand tracks and inside features of Circular Sock Knitting Machine collar

Just glue 600 or finer sandpaper to the underside (and a sidewall if you want to sand inside wall surface)
I'd recommend wet sanding, especially for PLA

Print 3 walls, 5 bottom layers and >20% any infill to keep it rigid