@Kanedias I second the loctite. I had my first y-axis skip after 8 hours into a 48 hour print. I think it was because my z axis sensor was a little low and caught so have reset that but I am also putting loctite on all of the grubscrews which go onto the hardened rods. If figure those on the steppers should be OK as the at least are located onto a flat...I may end up just doing all of them though. I also had a failure last night of the fan support which I know Livi had several times. I stuck it back together and will see today if it is going to work or if I need to print a new carriage. Maybe all of the screws need a tighten after a fews weeks of running.