Anyone around Pakenham, Victoria, Australia by any chance that really knows their stuff? I've got a weird issue where the Z axis will not rise from the fully down position on occasion.
Once its started moving its fine but just starting sometimes it dosnt start (however makes noise like its trying to). You give it a touch and up it goes but if not immediatly then the code is out as it thinks the bed is closer to the extruder than it actually is.

Hope this makes sense - Had someone mention it may be the z axis leadscrew nut but ive got no idea.

Thanks