zolcos1

Thanks! Turns out I just had to oil the rods and it's printing fine again.

I got the UM2 when it was new and used it moderately, it worked fine then. As of this morning I hadn't turned it on for at least 5 years. I updated the firmware then tried to do the leveling procedure and discovered that at certain points it stops moving and makes a bad buzzing sound like it's skipping/grinding the belts. Something starts preventing the belt-gear from rotating but I can't tell where exactly the resistance is coming from. When this happens it also loses track of its position, so when going left it tries to move left when it's already at the left edge and makes the same sound. Where should I start in getting it operational again?