[Inverted delta printer rod -- z calibration problem]

Basic Information:

FLSUN QQ-S PRO
Klipper on Raspberry Pi 4
klippy.log

Describe your issue:

Hi folks,
for my research, I am inverting a 3d printer extruder as shown in the figure. When I calibrated using normal 3d printer config, the calibration results were ok. However, if I inverted the rods, when I move the printer in X or Y direction, the Z moved down slightly

Example movement:
I moved Z down by 50 mm. then I moved +Y 60 mm, the Z was also moved down by about 20 mm

Why this problem happen? any ideas? Thanks.

[The image is copyrighted]
klippy (2).log (1.8 MB)