So this morning I've tried printing my first thing with large-ish dimensions (15cm on the X axis, 11cm on the Y axis). I've noticed that while the first layer printed really nicely towards the home position, the print head distance grew ever farther from the bed the closer it got to the top left corner. In that corner I had poor layer adhesion and poor infill behaviour because the fillament just dropped down to the layer instead of being deposited there directly. I'd guess around 1 to 1.5 mm more than near the bottom of the bed. So I tried auto-levelling the bed, and printing again. And I'm still getting the exact same behaviour after the auto-levelling (yes, I stored the new auto-levelling values to memory before trying to print again). And again I had the print head being noticeably further away from the bed in the top left corner. This time I had to abort the print because the PLA for the first layer didn't even properly reach the bed and was just pushed up against the print head so that the print head as pushing around a viscous mess of PLA. What may be compounding this is that my Big Box Pro does not seem to use the entire Y range when auto-levelling. The print head travels to just shy of the 160 mark instead of all the way to the 200 mark. I can move the entire range using the "Move axis" menu entry without problems and the print head finds the ooze bucket as well when running the calibration program. Any ideas on how to fix that pesky top left corner? The bottom left corner is fine by the way, and while the top right corner could be better it's not that bad that the print material can't reach the bed itself.