QIDI X-Plus 3: the bed crashes into the nozzle or the first layer does not stick

Symptom

On the X-Plus 3 the bed rises until it hits the nozzle when leveling or starting a print, or the first layer comes out with gaps between the lines and does not stick because the nozzle is too far away.

Likely causes, from most to least likely

1. The removable build plate is missing from the magnetic sheet: the leveling sensor only detects metal, and without the plate four screws are left exposed.
2. The Z offset was adjusted or a calibration was run from Fluidd: QIDI stores the offset in a different folder from Klipper's, and doing it from Fluidd throws it off.
3. The hotend is not fully inserted into the extruder after replacing it, or a nozzle of a different length has been fitted (QIDI's nozzle is a custom size).
4. The Z offset is not fine-tuned: leveling with paper is only an approximation and everyone feels the friction differently.

Checks to tell which one it is

• Check that the removable plate is fitted before leveling or printing.
• Think about whether you changed the Z offset or calibrated from Fluidd, or whether the problem started after replacing the hotend or the nozzle.
• Look at the first layer: if there are gaps between the lines, the nozzle is too far away; the lines should be joined with no gaps.

Before you start

Before taking anything apart, cleaning or adjusting it, switch the printer off and unplug it, unless a step says otherwise, and do not touch the nozzle, the heater block or the bed until they have cooled down. If in any doubt about electricity, heat or moving parts, stop and ask a professional.

Step-by-step fix

1. Fit the build plate

   Always place the removable plate on the magnetic sheet before leveling or printing; it is easy to forget after removing a print.

   Check: The bed stops before touching the nozzle when leveling.

   If that does not fix it: Reset the Z offset (next step).

2. Reset the Z offset if it was changed from Fluidd

   If you adjusted the Z offset or calibrated from Fluidd, use the restore factory settings option on the printer screen and restart it to recover the value. After that, adjust the offset and calibrations only from the screen.

   Check: After restarting and leveling, the bed no longer crashes into the nozzle.

   If that does not fix it: Check the hotend (next step).

3. Check how the hotend and nozzle are fitted

   With the printer off and the hotend cold, check that the hotend is pushed all the way into the extruder and that its screws go into their holes. Use the original nozzle: one of a different length leaves the tip lower than expected.

   Check: The nozzle tip sits at the right height and the crash stops.

   If that does not fix it: Fine-tune the Z offset (next step).

4. Fine-tune the Z offset on the first layer

   When the first layer starts, tap the Z icon on the screen and raise or lower the bed: start with 0.05 mm steps and fine-tune with 0.01 mm. Each change takes a second to apply, so do not tap too fast. The value is saved as you adjust it.

   Check: The first-layer lines are joined with no gaps and the print sticks.

   If that does not fix it: Contact QIDI technical support.

Prevention

• Put the removable plate back on the bed right after removing each print.
• Adjust the Z offset and calibrations only from the printer screen, not from Fluidd.
• After replacing the hotend or the nozzle, check how it is fitted before leveling.

Still not fixed?

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Printers it applies to

Qidi X-Plus 3.

Official sources

This guide summarises the official documentation linked here:

• The build bed hits the nozzle · QIDI
• Filament Not Sticking to the Bed (X-Plus 3) · QIDI