By the way i have found one thread about this topic: https://forum.duet3d.com/topic/18942/calculating-tool-offset-cnc/3?_=1604994474624

@dc42 thank you for the quick answer.
Do i have to configure also the "Tool Heigt Probe" like the BL-Touch in the config.g with the M558 and G10 command.

What i don't understand is were do i have to change the the Tool Z-Offset? directly in the config.g file or do i have override the value bevor printing?

It would be great if you have more detailed information about this problem or also when tere is a thread who already a discussion is been made. Unfortunately i diddn't found the right information in the forum.

Hi,

i want to use a "Tool Height Probe" (mechanical switch like in the picture below) to detect the actual Nozzle height for different tools at one 3D-Printer at a certain Temperature.
I thought one possibillity to achive this is to override the Z-Offset in the config.g file at the selectet Tool.
I would like to use G-Code Meta Commands: https://duet3d.dozuki.com/Wiki/GCode_Meta_Commands
But im not sure if it is possible, because variable declaration and assignment is not implementet yet.

Also i would like to know if ther is another posibility to change the Tool Z-Offset without going into the config.g file and the need to restar the firmware.

I use:
Toolchanger (4 Tools)
BL-Touch (Mesh bed compensation)
Duet2 Ethernet Board
Firmware 3.1.1

I would be glad if you guys have some thoughts on this projekt. Also maybe there is someone who already implemented such system into a 3D-Printer or have a differernt way to achive it.

@fcwilt Yes i did a G30 command but i think i didn't reload the heighmap

@davidvh86 no i did not included the loading sequence at the beginning of the print but i'll try it

@fcwilt thank you for clarifying the difference.

I recently tried Mesh Bed Compensation at my own printer. I used G29 and Probed the Bed with my BL-Touch, i got also a heighmap.csv file... and enebled the Mesh Bed Compensation but it didn't worked (Z-Axis was not correcting the heigh or low spots). Is there maximum error needed that the compensation works? Because i also created an error of over 1 mm to see if the Z-Axis is moving.

I try it again and see if it works.

Hi,

i know there are may discussions about "Mesh Bed Compensation" in this forum. But i couldn't find a answer why Mesh Bed compensation is only possible with two or more Z-Axis. As far as i understand it is, that the independend Z-Axis are only there to level the bed. And not to compensate any hills in the heatbed am i right?

Let's say i use a Heated bed, which mostly everybody uses, i get more or less warping effect of the printbed due to different heatbed temperatures.
What i really want is that my Z-axis is moving up or down at the "Hills of the Heatbed" so that i get a consistant layerheight of the first layer.

So why doesn't work it with only one Z-Axis either or does it and i did got this wrong?

@zapta your'e right I only want to reduce the chance of unintentional changes. In first place I would only secure the system files like Config.g, Home.g ...

@zapta yes I think so. But I haven't thought it all the way through yet. If you have some suggestion, I'll be very thankful.

Thanks for the answers. At the moment I will try the M551 comment, but for long therm application I try it to implement it by my own at the DWC.