I finally have my MPCNC assembled and working, but I can’t seem to get square cuts out of it. I printed everything myself (no scaling) in PETG, and had no fitment issues while assembling. I bought the bundle from the vicious webshop. I have no endstops, and the total rail length is 31"x31".
I spent a few days last week trying to square up the frame unsuccessfully, but I printed the updated corners, and I’m now confident my frame is square (I used dowels cut to length to ensure the rails were the same distance apart, and the diagonals are within 1/32"). My squares are still coming out parallelograms, and circles aren’t perfectly round. See attached photos. Both sides of the square are the same distance apart and parallel, but the diagonals are about .5mm off on this ~20mm square. You can also see with a ruler that the corners aren’t 90 deg.
I pulled the 4 3" bolts from the center assembly, and then reassembled while it was all on the rails, but that didn’t seem to help. I’m not sure what to try next, and am starting to get frustrated…any suggestions?