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Just wanted to say thanks. After putting in the Igus Drylin bearings it always seemed a bit stiffer. Your post (and harrygeier's reply) prompted me to pull apart the heatbed and the hotend and really look into why they were binding so much. It turns out on both the heatbed and the hotend, there was a linear bearing where I hadn't snapped the circlip correctly back into place. Thats it.

I also found another issue: The right x-axis block/tensioner I printed (from here) is slightly too narrow for the two bearings, meaning they don't roll easily and making it very difficult for the belt to move about. Should be easy enough to get the dremel into it.

X Axis motor mount for Anet A8 or Prusa i3
by Randino