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Just made one with my Anet A8, the screw threaded into the plate perfectly (very tight fit but does not bind). The L and R brackets needed to be filed down quite a bit for them to fit, and I also filed the holes in the frame just a tiny bit, but it wasn't that much work and now it's a perfect fit. I would say use thick walls for the brackets, but it doesn't really matter since the nut has to fit, limiting the thickness anyway. I haven't actually done any calibration boxes with my printer yet.