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Edit: I managed to solve my problem by slightly loosening the bearing housings from the heated bed frame. The bed is now sliding smoother. Thank you everyone.

I've had the A8 for about 5 days now, but after a couple of days the stock linear bearings on the y-axis rods (the ones holding the heated bed), made this horrible grinding noise whenever the the bed was moved along the y-axis. I decided to purchase Igus Drylin LM8UU Polymer bearings (http://www.ebay.com/itm/3D-Printer-Solid-Polymer-LM8UU-Bearing-8mm-shaft-Igus-Drylin-RJ4JP-01-08-/201571607189?var=&hash=item2eee9aa295:m:mHflNMVxgB3DEgcF_dKWemg) to replace the stock bearings. Everything worked out I guess, but now when I'm printing, the y-axis motor has a very hard time moving the heated bed. The movements are choppy, which messes up the prints. The y-axis motor also gets very hot, way hotter than the the x-axis motor for example. I think that's also maybe because there's something wrong with the bearings.

It would be weird however since the Igus bearings glided really smoothly when I had the guiding rods seperate from the printer. Now that they are installed in the printer, it takes alot of force to move the bed. Maybe the rods aren't aligned or something? I don't know if that's an issue that can even happen with the Anet A8. Anyways, any ideas or suggestions are welcome!