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Could also be blown aurdino voltage regulator blew 2 gettingy prusa up and running. Clip the axis if youose it the bed sliding is enough to blow it I found

Is it auto bed leveling? The ridge might be where it is moving in all 3axis at the same time making it go just a fraction on a mm out of line where the bed is high or low. Had a friend with an i3 see...

And all the whiners saying it is rascist can go out develop there own perfect skintone filament and spent millions of dollars making it and let it sit in a warehouse unsold while being called racist

A working mouse liver within 2 years is a stretch I think and human ones within 4 and full scale 4years after is all but impossible tale longer than that for the govt to decide it is safe and minutes...

Is the nozzle loose had a problem with mine. Left and right side of cube looked great, front and back was jagged ended up the nozzle had play in the extruder a big washer fixed it for me.

yep working on my 3rd mega right now finally found out it was a bad trace on the ramps so that moving the hotebd pretty much at all blew the voltage regulator ;-( live and learn