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300mm, There really isn’t a super easy way to do it. I would suggest the Y axis. Beside longer rods and belt you need to extend the side pieces 50mm in both directions. Not too bad but not a quick change.
Dual head, Bowden setup would be Pretty simple might fit as is. If you want 2 direct drive extruders you need to extend the X axis the length of your second extruder on both sides. Belt, rods, front and back piece, and the large face plate.
So at that point you would be altering all the dxf’s.
Adding it all on 1 axis seems easier but you would have an axis with, I am guessing, 200mm extra length. Not Ideal.
Might as well use the MPCNC for the big stuff and use the other printer/s for the smaller things. Tough call.