Tried surfacing the waste board, not sure how it came out

Oh, so if there are gaps at the front right and back left, there’s no real need to sort it out?

How can I check the gantry is square to the Y rails?

Looks square on all sides. I did find a slightly loose v wheel on the X plate. After tightening it, the slop I had before disappeared. Will see if that makes any difference with the ridges.

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The best way to check for square is to begin to tram your wasteboard or to mill a pocket out of as large a piece of scrap as will fit — once you’ve got a pass which goes all the way down along two legs of a corner use a known good square to check and see if they form a right angle.