Strange shifting problem with prints on UMO+

[thixio1 0]

Strange shiftig occurs after a certain height of the prints. Observe the flawless printing for the small brain, while the large brain suffers from artefacts starting from a certain height. Also, the belt of the motor on the back left gets loose every time, although I straightened it by pushing down the motor and fixing it by tightening its screws like hell.

Any ideas or suggestions would be highly appreciated!

Marc

Edited September 7, 2015 by Guest

[DidierKlein 730]

Either you have a loose pulley somewhere or the short belts are touching the woodframe

[thixio1 0]

I reduced the acceleration to 1100 and it works just fine again.

[thixio1 0]

Either it was mechanical (pulley) or overheating of the stepper motors.

[neotko 1,418]

Umo+ in theory (unless if it's summer in spain) stepper motor chips can't get hot enough. Try to check the calibration. Adjust the pulleys and check the small belt tension. I can print very fast with aceleration at 2000-2500 and travel moves of 200. Of. I changed my belts/pulleys to gt2 but I been using that speeds with the mxl stock without problems.