Here's the gcode for a disc to hold magnets I made for a buddy of mine to perfect perpetual motion......could take a while!

It's a radial toolpath in Metric.

You'll need a 6.35mm ballnose cutter (1/4" in old money)

It's cut out of 18mm MDF and around 250mm Diameter as I recall.

I've attached the .iges file too....I hope