Notes from the author about this project.Simple wasteboard designed for the stock MDF provided with your Shapeoko 3 XL. For my implementation, I removed the wasteboard, flipped it over, ran the operation, installed my threaded inserts, flipped it back over and reinstalled to the Shapeoko. The flange on the threaded insert installed from underneath the wasteboard provides a little more strength to your holds.
The layout is also designed to avoid any of the bolts used in mounting the MDF to the Shapeoko frame.
One note of caution. Be sure to measure the thickness of your wasteboard exactly and set the depth for your hole slightly short so you don't hit your support straps.