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Hey, very nice design! Hope to find time to do this some day...

A design consideration: it would be possible to reduce the number of motors to just 3 (1 per axis) by moving the x-y end motors to the center? Probably this would increase the complexity (at the center) and reduce the torsional rigidity (maybe counter act this by increasing the bearings footprint at the x-y ends?). I know small motors are cheap, but not if want to you scale this up.