Prusa Mini x axis issue
Hello sorry I posted this in the wrong place.
I may have an issue with the x axis out rig printed part plus idler pulley. The belt seems to be rubbing the pulley and making a mess inside the printed part( F1). Does anyone know what F1 stands for. Anyways I printed another part with (R2) on it. It still seems to be riding towards the front on the printer on the pulley. Any help would be great. Please see picture before I changed part. 
RE: Prusa Mini x axis issue
I noticed the belt being not centered on the pulley on my printer as well when it started to make a 'lovely' (insert sarcasm) squealing noise when moving in the X direction. I loosened the 3 face screws a turn and also applied some lubricant on the belt/pulley. Noise gone.
Since my printer is black on black I cant tell is it has that little bit of rubbed off belt though. Also my parts are R2.