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Mine is not fully functional at this point either (although it could be… i just lack time in the summer)
My build is 60″ square. I have supported the mid way point on the exterior rails… That makes a huge difference in the rigidity of those axis. I would suggest adding supports as well on those longer axis. The concern is increasing the rigidity of the conduit on the internal X and Y rails, The new center design seems to increase rigidity a fair amount.
I printed a ramps case with a 80mm fan from thingiverse to keep it protected and cool.