RE: Any Ideas?
Check your grub screws on the motors / gears and your first later looks a bit too low.
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Chuck H
3D Printer Review Blog
RE: Any Ideas?
* Pulley screws on X motor not properly tightened. One has to be tightened against the flat side of the motor shaft!
* Belt not correctly tightened. Use this tension meter to get it right: https://www.prusaprinters.org/prints/46639
* X carriage over-squeezed. Loosen the back plate on the X carriage axis.
* Nozzle hit an obstacle. Some patterns such as grid have lines that cross within one layer. This can lead to little pile-ups at the intersection points, in particular if you have slight overextrusion, which in turn can lead to the nozzle catching at those pile-ups. See https://help.prusa3d.com/en/article/infill-patterns_177130/
* Zip ties on the wire bundle on the back of the extruder not properly positioned, so they or the cables hit the model.
Formerly known on this forum as @fuchsr -- until all hell broke loose with the forum software...