Worried that your 3D printer assembly was a bit off? The Original Prusa i3 MK2 unique Calibrate XYZ function offers perfect 3D printing anyway! Since 3.0.6 firmware, the printer can automatically find the calibration points and because it knows its geometry (how skewed the axes are) it can correct it live during the print as it does with automatic mesh bed levelling. MK2 is the first printer on the planet with this ability! You can read more about it at http://prusaprinters.org/first-printer-to-