11.6 Calibration issues

11.6.1 Nozzle taps the glass

In case the printbed is at its lowest position set by the Z-adjusters and yet nozzle taps the glass you have to adjust the Z-axis endstop holder.

• Move the Z-axis endstop holder approximately 0.5-1 mm upwards. Push a Z rod as shown in picture below to secure its position.
• Recalibrate the printer.

Pict. 17 - How to move up a Z-axis endstop holder

11.6.2 Different spacing between nozzle and glass after every Z-axis reset

• Tighten the screws holding a Z-axis endstop.

11.6.3 Glass is unstable and doesn’t hold firmly

• Unstable glass may be caused by two different reasons. First check if there is any dirt between the glass and heatbed. If yes, remove all dirt.
• Glass instability may be caused by uneven position of the Z-adjusters.
• Set all Z-adjusters to the lowest position - heatbed has to be at the lowest possible position.
• Recalibrate the printer.
• Tighten all Z-adjusters evenly to avoid the printbed deflection.

11.6.4 Default X-axis position is outside the glass

• Move the X-axis endstop to the right so endstop would form a plane with the printer frame.
• Reset the X-axis.
• If the microswitch moves to the left with the extruder movement, tighten the ziptie holding a switch or change the ziptie and tighten it properly.

11.6.5 Uneven spacing of the nozzle on the X-axis opposite ends

• Check if the distance between X-ends and Z-endstop holders is the same on both sides.
• Hold one of the Z-axis threaded rods and rotate with the other one to straighten the difference.
• Reset the Z-axis and recalibrate the printer.