Ok, so this is whats now consistently happening after 13 mm. It is only shifting in the y-direction. I greased what needed to be greased and tightened everything down. I have put a fan on the y-stepper motor. Ive even tried changing the temperature of the bed. Still not sure what to do now.
Check the current settings on your Y-Axis driver.
Could you have a ball bushing failure or timing belt jump. As a tool maker I can only address mechanical issues.
I do not think so, everything is tightened down. It gets worse as the print goes on so Im wondering if its the motor
I had a similar issue a while back that ended up being my travel speed set too high for a certain section in a sliced part. I cured it by lowering the travel speed and reslicing. It was something odd in a specific item because other prints were fine at the same travel speed. Im sure there is a mechanical way to cure it, but since it was a rare thing for me, printing with a slower travel speed for that item was no big deal… Of course YRMV
Im trying that right now. 45mm/s seeing what it does different.
205 grades and profile Lulsbot
Lower the acceleration of the y-axis. Send M201Y500 and see if that helps.
Shot in the dark, but you might also check the gcode to make sure your slicer isn’t goofing up. Although I’d say that’s more of a last resort, I’ve seen seen a few people catch it happening when reading blogs.
Very unlikely though.
Check grub screws on the y drive gear?
Which electronics board? If stepsticks or older pololus are involved it may be the drivers overheating. In that case lower the current or cool the drivers ( a fan may be necessary, you really need to cool the underside of the driver boards).
Ramps pololu