Prusa MK3 Y-Axis Motor Mount with 3rd motor mounting hole
thingiverse
I created a customized version of the Y-Axis mount found on Thingiverse at https://www.thingiverse.com/thing:2777432, adding a third motor mounting hole for added functionality. I'm unsure whether this modification makes sense, but here's my attempt. Using 10mm M3 screws should be sufficient, providing seven thread windings; however, if that's not enough, you can try using 12mm M3 screws, though it's unclear whether they will fit within the round opening.
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