Check and double check.
Posted: Sat Jan 10, 2015 1:52 pm
After hours of bad results during extensive calibration process, I found an embarrassing problem. I was in the middle of a 20mm hollow box print and I went to get another hard cider and I bumped the table the printer is on as I went by. I came back and found my part was now printing at a slight angle...WHAT THE... I started to investigate and found that I could move the xyz towers around slightly causing visible changes in the part. I popped the plex covers off and sure enough the allen head bolts that clamp the aluminum towers were finger tight, top and bottom. I remember getting these tight but I store my printer in a much colder area then bring it into a warm environment when I am home 
and I think this may have contributed to this problem.
and I think this may have contributed to this problem.