[BUG] Freeze at layer change (HC32)

[elfl0rd]

Did you test the latest bugfix-2.1.x code?

Yes, and the problem still exists.

Bug Description

I found that during layer change, the printer freezes for 1-5 seconds.
It hangs completely, even the screen stops responding to the encoder.
The problem is that it is leaking material, so the printer makes an overlap at the seam.
As you can see at the end of the video, the printer changed the layer (height from 1.4 to 1.6) while hanging and made a blot in the corner. The photo shows the blot on the substrate, also during the layer change.
The problem does NOT occur on AUTO_BED_LEVELING_BILINEAR, only on UBL (AUTO_BED_LEVELING_UBL).

reference to issue:
classicrocker883/MRiscoCProUI#213

Pictures and video:

video_2025-05-13_20-51-55.zip

Bug Timeline

No response

Expected behavior

No response

Actual behavior

Stops printing for several seconds on layer change

Steps to Reproduce

No response

Version of Marlin Firmware

bugfix2.1.x

Printer model

Voxelab Aquila X2 - HC32

Electronics

BL-Touch

LCD/Controller

No response

Other add-ons

No response

Bed Leveling

UBL Bilinear mesh

Your Slicer

None

Host Software

None

Don't forget to include

• A ZIP file containing your Configuration.h and Configuration_adv.h.

Additional information & file uploads

configs.zip

Changes to lcd/proui/dwin_defines.h:

//#define HAS_GCODE_PREVIEW 1   // Preview G-code model thumbnail
#define USE_GRID_MESHVIEWER 1
// #define HAS_LOCKSCREEN 1      // Simple lockscreen