My x-axis bearing has a lot of play (around 2-3mm at the nozzle) in the direction of the y-axis. This problem has developed over the 5 months that I have been working on the printer. Not too long ago I took the gantry apart to clean the rails, as well as tighten any loose screws (boy were there a lot, I must have been too scared to tighten them down before). I found the play when I was putting the machine back together. Has anybody else had this problem? If so, how did you fix it? If not, what would you recommend to fix it? Thanks for all help!