It's definitely hardware and not software. Either a pulley is slipping or you are losing steps. You can lose steps if the voltage is too low (very unlikely so look into this last). Most likely is what illuminarti said. Tighten all 6 (yes six!) set screws in all 6 pulleys for the Y axis. Tighten the hell out of those set screws. Most likely it's one of the 2 pulleys on the short axis.
Also look at the short belt. If the belt twists differently everytime it changes direction, then it is probably rubbing against the wood frame. Move the pulleys a mm more away from the frame by using washers under the spacer and make sure the motor gear is as close as possible to the motor without touching.
Recommended Posts
illuminarti 18
Almost certainly one or other pulleys for the y-axis is slipping. Check that they are all tight, includin the one on the motor itself. You might want to use a sharpie marker to put a mark on the pulley and shaft, and make sure that the marks don't move as you print.
Link to post
Share on other sites