The world was rid of yet another wobbly z axis today. Justice has been served! The concept for the part I designed is not new; all I did was make a z nut trap that has its rotation constrained by two arms stuck in the extrusion. The nut trap is however not directly connected to the x axis, allowing any x and y motion of the z drive to occur without moving the x bridge.
I second that. It was one of the best things I could do for my printer, especially since I was using cheap 5MM threaded rod and one was bent and would cause wobbling. http://www.thingiverse.com/thing:141479
This will introduce a new issue if you print fine print layers. That wobble will change the angle of the nut as it is being un-wobbled. This means that the nut is a smidgen tighter or looser depending on where in the wobble the current height is. It’s a problem at .1 for me, mostly unnoticed at .15 and I don’t see it at higher layer heights.
It’s a much more subtle effect than the Z wobble this fixes. I accepted it as ‘good enough’ for a long time.
I ended up replacing my metal Z couplers with vinyl tubing & moving the bent Z threaded rods down to the bottom Y axis frame rods.
@Mike_Creuzer I had read that this was a problem, and already have a plan for how I could fix it, but I probably won’t get around to it until I disassemble more of the printer (which I’ll be doing once I switch the Y carriage to an aluminum plate in the near future).
I just chose to live with it until I rebuilt my printer. It’s SO much better than it was, isn’t it?
Makes sense. I heard that before. I guess I will get off my butt and order some replacement rods.