G30 start Gcode

cichaczech

Hi,
I have problem to keep righr nozzel distance from bed.
After power up printer it homes all axes and perform bed compensation

G28   ;Z max, X & Y min
G0 X150 Y150
G30 ;find real Z0
G29 S0

When I start printing now without starting script it prints perfectly, but if I use G30 (starting script) it starts printing 0,8mm above bed.

do you know why? thank you

Phaedrux

We need to see the config.g, homeall.g bed.g files as well as a description of what kind of printer it is, and which duet board it is, and what firmware version you are using.

cichaczech

Yesterday I thing I found the problem. I set Home Z max to 250mm but actualy it was 250.8mm, so when I started G30 bed raised to 250 and BLTouch somehow automaticaly click itself even if the bed was still 0.8 below triggering. ???? I don't know. ( I tried disconnect Z stepper an run G30, after the printer was thinking it raised bed 250mm BLTouch clicked and printer was displaing Z = 0.0)
Now I defined Z Max 260 and it seems working fine.

bed.g
config.g
Hv6BS60.g
homeall.g

Board is Duet2 Wifi with firmware 2.04RC3.

Veti

you config does not have any settings for the bltouch.

cichaczech

sorry, I forgot. Printer works with multiple tools so config is just generic definition of machine.
For 3D printing I am using macro Hv6BS60.g .

Veti

you are missing
M574 Z1 S2

cichaczech

@Veti said in G30 start Gcode:

you are missing
M574 Z1 S2

this will home to Z MIN with probe after G28, but in homeall is to home to MAX and I wold like to home to MAX
problem was G30 and why if the printer thinks it is in Z0, it trigger BLtouch automaticaly even if Z axis was disconnected

Veti

you can not use z max endstop and probe at the same time.

Phaedrux

@Veti said in G30 start Gcode:

you can not use z max endstop and probe at the same time.

Well you could use one then the other.