Possibilities to adjust the z-offset (without the config.g file)

[CR3D]

@bot

the printers all run flawlessly and i constantly deal with the matter. this special question has arisen again and again in the course of time. I basically know how to adjust the Z offset. For printers with a complete Duet setup, I always do this via the config.g file. However, the special way via USB is unfortunately not known to me. and I unfortunately only have the option of this setup via USB. Is there an option here? Then I would be very grateful for help!

And yes, I know the GCode list very well!

[Phaedrux]

I'm not really sure what you mean. But if you send G31 by itself it will respond with what the currently set value is.

To measure the current trigger height a macro could be created that prompts the user to jog the nozzle to touch the bed and then uses G30 S-1 to report it to the console, or you can use G30 S-3 in the same way with the difference that it sets the trigger height immediately without having to chnage config.g. That value can be saved to config-override with M500 P31.

[CR3D]

@Phaedrux Ok thank you!

Where is the definition of the G30 "S" parameters? i have never read something about "S-3"
Thank you a lot!

[Phaedrux]

I thought you knew the gcode list very well!

https://duet3d.dozuki.com/Wiki/Gcode#Section_G30_Single_Z_Probe

[CR3D]

@Phaedrux

Oh my mistake!

I was there... the general G code overview
https://reprap.org/wiki/G-code

Thanks... I will test it!

[zapta]

@CR3D, what you will need is to have the ability to send gcodes over the USB and to retrieve their response, using some script or software. Once you will have that capability, you will have very good control over the printer.

[CR3D]

@zapta

Yes I can send Commands and I can receive Messages from the Duet.
I will test and report

Thanks!

[mrehorstdmd]

@CR3D You could always implement an adjustable Z=0 endstop... See: https://drmrehorst.blogspot.com/2020/03/a-new-z-axis-optical-endstop-design-for.html

[CR3D]

@Phaedrux

Ok thank you for your answers...

I will test it now.

Must the z offset be configurated in the config.override that i can change it?

@mrehorstdmd that´s not possible, because it is fixed on the toolhead directly

[A Former User]

@CR3D said in Possibilities to adjust the z-offset (without the config.g file):

Must the z offset be configurated in the config.override that i can change it?

if it is in config-overrigde.g that is where you need to update it (as it would otherwise override you do in config.g)

if its not already in config-override.g it doesn't matter where you put it; but if you intend on using M500 it will be saved to config-override.g

[zapta]

@bearer, it is possible to read/write a duet file (e.g. a macro) using the USB/Serial port?

(If so, any configuration can be saved in a file that is invoked by the standard config.)

[A Former User]

@zapta haven't tried tbh, but afaik you can use g-code and that shouldn't matter which channel is in use

https://duet3d.dozuki.com/Wiki/Gcode#Section_M28_Begin_write_to_SD_card

(you can't read and parse the file, but ofc executing it should achieve the same thing)

[CR3D]

Thank you everybody for your help!

My solution is following:

1. Read out my z-offset with G31 via serial command in the console of my server
2. Change my Z-Offset with G31 Z?.?
3. Save settings with M500 G31

This is working well for me

Thank you!

[CR3D]

@bearer

The M98 command also works via Serial Port. This also would be one solution!

The M28 command i never tested till yet...