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I just tipped my machine over to test it. The axis does indeed slide down under gravity, but it does it slowly and smoothly. When energized, the steppers had no issue moving where they wanted. I didn’t do a job, though — just a “does this explode” test.
I might try it later if space gets tight. My build is probably mediocre — it’s on a sheet of 1/2″ OSB on top of a frame of 2x4s, all mounted on a collapsable card table. The legs have wobble, but the actual mechanism on top is solid. I had to do it like that because it’s wide enough that I have to be able to collapse legs and carry it on its side to get it through doors (it’s 32″ square).
For now, I’ll file my idea under “worth considering later” pile. I have a lot to do before that, though.