Unstable Z (@calibration)
Running My Z calibration seems to jump by at least 0.6mm after i changed BL touch Z offset.
e.g. i adjust the "z offset" by 0.05mm and the physical offset changes from the usual range of -0.1 to +0.1mm, to the something like -0.2mm to +0.8mm - with a large random element to it.
Config snip (including previous value):
BL Touch
[include config/z-probe/bltouch.cfg]
[bltouch]
#z_offset: 3.30 # HBS april 2023
z_offset: 3.35 # HBS april 2025
As you can see my offset is unchanged for two years, and I only did a very small adjustment but now it is all over the place after every calibration.
i have double checked for physical problems, and find nothing - everything seems as rigid as expected.
Info:
Vcore3 500, changed to V.3.1.
Klipper, RatOS 1.0
Prefered z-offset verification: heat bed to 60C, heat Nozzle to 200C, wait 5-10 min. auto calibrate x,y,z, z tilt, and z again. 0.15mm paper under nozzle, adjust z down til resistance i felt when moving paper.
The printer is usually very stable, and nothing was changed for a year or so....
4 Replies
SOLVED: hotend PETG parts deformed by printing high temp, leading to every screw being very loose.... Stupid me. where do i buy a set of heatresistant parts for my EVA3 mosquitto hotend?
you will probably have to print them yourself or maybe someone in #print-services can help
Green part (PETG) was used to print the red (ASA). The Green needed a bit of Dremmel-care before the hotend assembly would be firm enough to print (at low speed)
Remember to change to heat resistant hotend before printing hot 🤓