Intermittent nozzle scraping/dragging on build plate during pre-print sequence #533
Description
Is there an existing issue for this problem?
- I have searched the existing issues
CrealityPrint Version
6.3.1.3548, 7.0.0.4127
Operating System (OS)
Linux
OS Version
Ubuntu 24.04
Additional system information
No response
Printer
Creality K1-MAX
How to reproduce
Slice a model using Creality Print.
- Start the print job.
- Observe the pre-print preparation (homing, leveling, or moving to the purge line start).
- Intermittently, the nozzle moves diagonally across the bed while being pressed against the surface.
Actual results
I am experiencing a critical issue where the nozzle occasionally scrapes the build plate during the pre-print preparation phase. This behavior is inconsistent; it doesn't happen every time, but when it does, it leaves deep scratches (triangular patterns) on the plate. It seems like the printer is performing a diagonal move across the bed without sufficient Z-axis clearance.
Actual Behavior: The nozzle drags across the bed, creating deep scratches in a triangular pattern. This suggests a Z-axis positioning error or a missing "lift" command in the start G-code.
Expected results
The nozzle should lift to a safe height before performing any horizontal movements across the build area during the startup sequence.
Project file & Debug log uploads
Creality Print.zip
Shit happened twice: in V7 is around debug_Wed_Feb_04_10_42_08_1465361.log (textured plate) and V6 is around debug_Tue_Feb_03_14_07_17_1121685.log (smooth plate)
Checklist of files to include
- Log file
- Project file
Anything else?
I have performed full calibration and Z-offset adjustment after changing the plate. Since the issue is intermittent, it feels like a software/G-code logic bug rather than a hardware leveling issue.