Were you trying to constrain the leadscrews at both the top and the bottom? That will cause binding because the wobble has no where to dissipate. I imagine you can't really leave the tops completely loose on leadscrews that long, but did you try something that had maybe 1-2mm of radial "give" in it?
I tried to keep it somewhat loose at the top but I wasn't sure how it would affect the accuracy. So I'm tying it this way and it seems to be working but once I have the extruder on there I may need to do a counter weight to make the z axis weightless taking strain off the motors.
I like your X carriage much better than the one I made for my printed ORD bot. When I have the time to design a new extruder body I will go to a flat vertical plate like you have.
JeremyBP wrote:Now that's clever. A couple thing that may be useful for the MK7: steps/mm: 100.323 (1/16th steps) PID values: 17.9 (P). 0.8 (I), 133.72 (D)
Thanks I have updated my firmware. I can't get printing quite yet. I ran out of belt and ordered some more. Man I wish you could find this stuff locally.