Hi All. So I have a very strange issue that I cannot understand. I have spent a lot of time getting my i3 to print just right, and mostly it prints with what I would call outstanding quality (see the good print image). But occasionally errors get introduced to the print randomly and for no particular reason. What is strange is my x-axis appears to drift, and then it comes back to where it should be and continues on....how can this be? I have had slipping belts before, but it never "corrects itself", this has to be a problem with the software, sli3er...I can't explain it (see print error picture). Nothing is loose, the belt is nicely tensioned (with tensioning springs), the voltages of the stepper correctly set (I have to push with considerable force to stop the x-axis carriage - approx 0.6v). Heat sinks on the drivers, and a fan. Nothing even gets slightly warm...so not over driving it, for certain. Can anyone provide some idea what this could be because i am a total loss, especially since it then corrects itself and carries on, slips again, corrects itself, etc.