While cheap hobby CNC mills and routers are great machines ... They’re usually powered by a Dremel or other rotary tool, so speed control of the spindle via Gcode is nigh impossible.

But it's actually a CNC (Computer Numerical Control) machine ... have needs for parts I wouldn't brother with 3D printing, like hobbyist-class RC car upgrades and replacement parts for my personal ...

The result is remarkable: with a lot — and we mean a lot — of sanding and polishing, you can make an acrylic lens on a cheap hobby CNC machine. The trick is just a very small stepover on your ...