So not sure what happened. Printed a perfectly good job. Went out for a while, then returned to print another job. Everything now prints about 3mm above the bed. I do autohome and it seems to do it, but printing one of the calibration cubes I have stored on the card prints up in the air. I leveled the bed, and the "highest" value was about 1 with some reaching 0 without putting enough tension on the paper. Any idea what happened and what I should do about it? Note, I did take the glass off to clean it between the jobs, but it went right back on and is clipped in place.