So I'm in the final stages of assembling my Pro. I'm currently stuck on the z-axis calibration step. After choosing "Move Axis" -> "0.1mm" -> "Move Z" and turning the knob so that the bed moves all the way up, there is still a 5-6 mm gap between the nozzle and the glas bed. I'm stumped. Looking under the print bed, I can see that the lead screws still have a few mm left, that would theoretically allow further upward movement... Did I install some mechanical part upside down, that's causing the gap? Or is the firmware just refusing to go those last few mm for some reason? Any help appreciated!