Question about trigger height BL-Touch
Hello, I have following question for my Tevo Delta printer:
In your docs under calibrating a delta printer I read
"When you have established what the trigger height is, set the Z parameter og the G31 command in config.g to that value."
In your docs under mesh bed calibration is
"find the G31 command and enter your trigger height as a negative value in the Z parameter (ex. G31 X0 Y0 Z-.43)".
Is the Z value now positive or negative in G31?
Thanks for the answer
mloidl last edited by
For my Hypercube using a BL-Touch i'm using a positive value.
; Z-Probe offsets G31 P25 X22.9 Y37.1 Z2.0 ; Z probe trigger value, offset in relation to nozzle. And trigger height adjustment
Thanks mloidl, but it's still unclear for me.
In your case, (sorry for my english) the Z value would be the height of the BL touch above the nozzle.
But if the G31 Z value is the nozzle height, it should be negative.
Your answer is in the Delta Calibration manual as corrct, but in the mesh grid manual it's negative.
OK, I'm an old man and maybe I miss something
peirof last edited by
i too have a TLM with Duet.... and i am using
G31 P25 X0 Y10 Z2.059 ; Configura el valor de activacion P50, y los offsets desde el Nozzle
This web help me...
mloidl last edited by
I followed the same instructions as mentioned by @peirof.
Especially the chapter https://betrue3d.dk/category/duet-wifi/bltouch/#5.1 (Find Z-Offset).
I, then entered the value which i got from the duet in the config file.
Thanks mloidl and peirof,
I will enter a positive value like peirof has, around 2mm.
G31 X0 Y0 Z-2.395 P25
But anyway, then the mesh grid manual is wrong and should be corrected:
"Once you are satisfied with your trigger height result (should be between 0 and 1mm, depending on your printer), open your config.g file (this can be found in your DuetWebControl), find the G31 command and enter your trigger height as a negative value in the Z parameter (ex. G31 X0 Y0 Z-.43)"
If the G31 Z parameter is positive, that means the probe triggers before the nozzle touches the bed. Example: IR sensor, inductive or capacitive sensor, BLTouch. If it is negative, that means the probe triggers when the tip of the nozzle is below the normal position of the bed surface. Examples: Smart Effector, Precision Piezo, FSRs under the bed supports.
autsch last edited by autsch
Now It makes sense, I din't care about the capacitive sensor yet.
But the smart effector is already here
Sorry for some stupid questions, I'm a newbee.
There is more to come...