I've been doing a lot of engraving lately (the empire map and now maps for the Vale). Engraving is a very X axis heavy operation where the head moves back and forth across every single line of the work piece. This has taken it's toll on the idler wheel and both bearings have worn out at the same time. It's a pain because I have a week until I require this new map so I'll have to phone up HPC in the morning and see what they can do to help me.
(Update: HPC sorted me out a new part and shipped it out next day, I was back up and running 48 hours later)