Router bushings
thingiverse
Some router bushings for a box making rig. There was a 50mm version that came with it, but we needed 37mm & 35mm, so I scanned the 50mm up, imported the jpg into autocad, traced it, changed the center diameter to 37mm, extrapolated out the locking and guiding mechanisms, and then made the 35mm one just 2mm fatter in the center circle. Hopefully it all works. it's essentially 4.5mm of 3d printed material. Print worked well, needs some sanding and a bit of filing, but it's all good. have uploaded the dwg's for your autocadding enjoyment.
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