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 plate.
Makerfarm Pegasus 12 (prusa i3 derivative)
.4mm nozzle, .25mm width lines
40% (but it doesn't really matter)
The shim wall is .75mm. Using .25mm lines gives 3 layers and makes for fairly accurate slicing. Used Cura 2.5 slicer.
Used Sketchup to make model. Used CADSpan STL exporter - I like it better than the Sketchup STL exporter. SU model included.