[REQUEST] Add toolhead offset for z-axis

[Skimmy]

Like the topic says, I miss the option to adjust the z-offset for each toolhead. While X & Y are available to adjust, Z isn't.

In my scenario, I have multiple standalone printheads that differ slightly in height. As for now, I don't know a single one (S3D-)-solution to adjust this. For example:

At first layer, tool0 is perfectly adjusted to the printbed. Then, changing to tool1, this tool is like 0.15mm higher over the printbed and therefor does not get good bedadhesion.

I tried to fix this via a toolchange-script, that works like "pick tool 1 and lift Z about 0.15mm". This does work for the rest of the layer (that had begun with tool0 printing fine, too). Then, S3D changes to the next layer, still printing with tool1 (I think, this is on purpose to minimize the number on toolchanges). BUT, and that is the problem, this change to the nextlayer is coded in absolute positioning, so Z will go down the (via toolchange adjusted) 0.15mm AND the desired layerheight of, lets asume, 0.2mm or such. So the new layer with the old printhead is way to high.

Same thing, just in reverse order, happens if tool1 is parked back. Toolchangescript needs to "readjust" the 0.15mm from before, but because of the absolute positioning, the then picked tool0 does print on a 0.15mm to low layer.

I can imagine, that a simple additional parameter-box for tool z-offset would solve this.

[CompoundCarl]

That's not good. If one nozzle is 0.15mm lower than the other, then that means it will literally drag through every layer of plastic you print by that same amount! You really should properly level the nozzles if they are that far off..

[Scatterplot]

Reread his post, he has different independent toolholders, not multiple tools on the same head. He's using them sequentially, not in parallel.

[Skimmy]

Half a year later and no response from the team? What a bummer...

[brian442]

I don't know why there's 2 identical requests for the same thing, but most of the firmwares I know of already implement toolhead offsets in the code. If you want to add Z-axis offsets, it would be really easy to do by adding a few lines to Marlin or Repetier. So that's one easy way to do it.