3D printable handle for deburring tool. Press fit onto four or six flute countersink shank to make convenient hand tool for keeping around the shop. I recommend a 90° included angle countersink so it can be used to deburr 82° countersunk holes. I modeled approximately .005" interference for press fit, so it might need reaming depending on the filament/printer you use. Shouldn't need support material.

I used this countersink from MSCDirect: https://www.mscdirect.com/product/details/63772487