As with any printer, leave all the screws a little loose, and then measure the square-ness diagonally, and make it equal, and then tighten all the screws. A hex tool (allen wrench) is included, but you may want to also get a ball-hex driver with a bigger soft handle to do most of the tightening.

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The finished frame is very very solid, 10 pounds (4.5 kg) without any other hardware attached. I think you could drop it on the floor and it would stay in alignment. And of course, with steel having half the thermal expansion of aluminum, temperature changes are less of a concern.

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