Shim for Dewalt DW611 in Openbuilds Router mount

This is a shim to allow the Dewalt DW611 router to be mounted in the Openbuilds router mount that was designed for a Bosch Colt router. While the nominal diameters are 71mm for the Colt and 69mm for the DW611, I found that with the vagaries of my printer (prusa i3 derivative), I needed .5 mm gap to make it actually fit. There is one shim that leaves 0.25mm gap that that was too small for my setup.

I also left some space for the corner connectors that hold the mount to the Z axis spindle pla