Step Blocks - Hold Down Tools - Shapeoko 2 or X-Carve

(OPENSCAD SOURCE INCLUDED)

Hold your work piece down on Shapeoko 2 threaded insert wasteboard. There are three sizes, Small, Med and Large. You can edit the parameters in the openscad source and generate custom versions too!!

I modeled these from a set of commercial ones used on my Milling Machine.

https://www.inventables.com/technologies/waste-board-with-threaded-inserts#30300-03