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The upper arms are installed 'loose', the screws are maybe half a turn into the nuts and I even have a small gap between the upper arms' top edges and the bottom of the top piece of the acrylic frame. If I tighten them at all I get the Y wobbly I talked about.

When you talk about the top piece of the frame moving in the x axis, do you mean left to right or front to back sort of motion? I've never noticed any of either with my build?