check to see if your axes move smoothly (ish... mine still require some force to get the head moving, but I would say like a moderate amount). Make sure they are aligned and the belts are tight. Loose belts cause the axes to skew during fast moves and that may make them bind. Those belts are such a nuisance!! How fast are you trying to go?
To get rid of this problem I had to realign my axes (using a pair of calipers!) and grease my rods (I used silicone grease like for foosball tables). I also slowed my printer down a bit (200 mm/s travel instead of 250). Some people have had success with taking the brass bushings out and sanding the insides of them to widen them a tiny bit. I was too lazy to take my printer apart to do that, but you might have to.
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Daid 306
It's a hardware problem. Most likely it's the small belt to the Y motor which doesn't have enough tension.
Check:
* All belt tensions
* Make sure all pulleys are tightly screwed on the axes
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