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