3D nozzle deburring / polishing bit

Have you seen those cheap Chinese E3D-compatible nozzles? If you look at one in a micrsocope you will see pits and burrs on the tip. Well, I thought I'd make something to help me polish those nozzle tips, and make the nozzles actually worthwhile to use, instead of risking failed prints due to the nozzle's poor quality.

This is a bit that fits in a standard 1/4" electric drill chuck. Screw your nozzle into it, put it into the electric drill, and spin it against some fine sandpaper for 20-30 seconds.

The photo shows a 0.3mm stainless steel nozzle that came with a package of [nozzle cleaning tools](https://www.amazon.com/gp/product/B07L9SGC8Z), before and after polishing. I wanted the tools, not the nozzles, but it seems I can rescue the nozzles. I gave up on the 0.2mm one because the hole is way off center.