As I’m a rookie at all things CNC I’m often surprised by what my machine does vs what I thought it would do. This can be painful when cutting a $60 sheet of ply.
I built this magnetic, spring loaded , slip on lead holder to help me pre-mark my cut paths.
It’s designed to fit over a Makita collet nut and can be installed over a 1/4 or 1/8 bit so no tool change is needed just attach the doodad and print. The spring loaded lead can handle about 3mm of Z movement.
As the crown test shows it has a a bit of wobble but less than the endmill width so I don’t care for prototyping and locating hold down screws.