Start of print issue with bed y-axis self calibration  

Start of print issue with bed y-axis self calibration

Hi everyone,

A little while back, I had an issue with a print, where somehow the X or the Y (or both) axis got offset somehow after about 20 mins into the print. What this looked like is that as the part was growing it was fine for a little, and then all of a sudden the infill was being printed a couple mm to one side. I cancelled the print and started again. This time within a few minutes, it would sense a crash and try to reinitialize itself. After several attempts it would not continue. Because when it was sensing the crash, there was no apparent crashing (ie. part was in  the middle of the bed and the extruder wasn't hitting anything weird), i turned off the crash detection. Since then, I have been encountering an issue with the y-axis self calibration when i start a print. If I turn on the machine and upload a print, it will go through its regular axis self-calibrations before laying its first line, I've noticed that (sometimes worse than others) the y-axis hits either the min or the max ends and starts skipping on the belt. The only way to solve this is to do a manual XYZ calibration every time I print and this is quite time consuming. 

Has anyone else had this issue, and how does one suggest I fix it?

Thanks,

Paul