Platform calibration will help ensure that objects adhere well to the platform and the object will no be deformed or slanted during print. It's not necessary for calibrating the platform every time. Platform calibration process only perform after moving the printer to other location or after changing the extruder
Inno3D Printer (M1 / D1) utilizes our automatic platform calibration technology. It's a very complicated and precise process, the print platform tolerant is around 0.05mm during calibration. If "Fail" message is displayed after platform calibration, please try to perform the platform calibration again, and ensure the nozzle touch the print platform with "Touch" message in LCD display by turning the knob at the top left Z-Axis (anti-clockwise a little bit more , around 1-2 degree more after "Touch" message is shown on LCD display.