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Well, the slot spacing is correct, I just needed to remove a chunk from the top right corner in order to clear the belt tensioning system. The only other problem that needs to be corrected before it will work properly on the "sturdy" Mendel90 is the opening for the hotend needs to be moved 7mm towards the back of the machine in order for the hotend to be centered in the opening and not be too close to the back of it - apparently, the "sturdy" uses a slightly longer fan duct, due to the larger size of the LM10UU bearings.