you nailed it, one of the belts had a small-ish amount of play in it, tightened up and seems alot better now.
these ultimakers require more love and attention than my wife! i wonder if i can sell her and get another Ultimaker,
i may put the idea to her and see.
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Daid 306
A photo always helps, but the most likely cause is some backlash caused by too little tension in the short belts. These can be really tight, just unscrew the motors a bit, push the motors down, and screw them down.
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