Summary

This is an attempt at hempcrete cnc. I used the most random threading I could make

10mm screw shape 1.5mm diameter x 16mm height

Use this to cast. I'm not sure if it holds a temp other than aluminum but I know pewter is pretty strong.

https://amzn.to/3snHyYR

v4 up, it grooves on 4 corners of the screw: up, down, up, down.