On one of the 3 Raise printers I use I watched the ball nut on the Z-axis rotate a few degrees during z-hop moves. This could cause some inconsistency in the layer thickness.
I understand that the screws are loose to prevent binding. Thinking about adding some spring washers or o-rings in the nut/bolt/flange interface to create a light clamping force but still allow lateral movement. Either that or make a collar that clamps on the top of the ball nut with an anti-rotation rod, perhaps running to one of the smooth Z-shafts so the nut cannot rotate but is not otherwise restricted.
Topics around mechanical design, controller and electronics. Mods & hacks welcome.
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Something like that would be nifty, but I don't see a straightforward way to add that to the machine without impacting the Z-height and needing to drill additional holes in the platform. I envision a simple arm that surrounds the bottom of the ball nut, mates with the flats, and is held in place with the existing screws.
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