Prusa XL - Quick Start G-Code - Không làm sạch vòi phun

Index of changes

15.12.2025 - G-Code Mod V1.01

• Preheat the nozzle to 175 degrees right from the start, not just at the end

• Tested with firmware versions 6.4.0 and 6.2.6

• Start G-Code V1.01 modified, tested and uploaded

12.12.2025 - G-Code Mod V1.00

• Bring the bed temperature to the set temperature immediately and as a first step for the first layer (blocking).

• Absorb Heat disabled

• Nozzle cleaning removed

• Start G-Code V1.00 modified, tested and uploaded

• Note on mechanical nozzle pre-cleaning added

11.12.2025 - GitHub

• Issue #5029 created - Status: Open 

03.12.2025 - Firmware 6.4.0

• Firmware updated to version 6.4.0

• Difficulties identified before printing began

• Temperature logic of the nozzle not understandable after firmware update

Disclaimer

I am not liable for any damage caused by the use of the G-code. The G-code has been shortened in some places and the order has been changed. From my side, I can confirm that it works flawlessly on a Prusa XL with 2 toolheads.

Reference

The start GCode was copied from PrusaSlicer 2.9.4 and modified to enable smooth operation with the Prusa XL.

Necessary preparatory work

The nozzle MUST always be cleaned before each print. There must be NO filament residue visible on the nozzle. If this step is not followed, the print bed levelling will not work.

Quickstart sequence

1.) Wait for bed temperature

Before anything is moved, the print bed is set to the temperature that was set in the slicer for the first layer. The nozzle is not heated. This first command should prepare the print bed for levelling.

2.) Z-Homing with cold nozzle

The print bed is at operating temperature and the nozzle is cold. With this combination, the Z-axis is ‘homed’.

3.) No nozzle cleaning

No filament comes out of the mechanically cleaned nozzle. Therefore, nozzle cleaning has been completely removed from the G-code.

4.) Bed leveling

Bed levelling is carried out as usual. The nozzle is and remains cold.

5.) Ready for take off

Once bed levelling has been successfully completed, the tool head is parked. Only now is the nozzle heated to the temperature required for the first layer.