Hey, BTW; someone just posted in the S1 Fb owners group that they fixed their problem by loosening the Y extrusion and retightening, but NOT over tightening. This makes sense as my Y extrusion definitely had a slight bind when sliding the bed (I never thought to try removing and reinstalling the extrusion, but several other users have chimed in that they tried this and it fixed their problem too). Hope this works for you.