If you want to use your json files, make sure that apart from changing "position" in "metadata" and "default_value" in "extruder_nr", don't forget to change "maximum_value" in "extruder_nr" to "3" for all 4 extruder json files.
Yes, there's quite a bit of redundancy in those files.
Edited by Guest
Same here. Tried to add a 3rd extruder to the Mark2 profile. Double checked all the position, default_value, maximum_value settings in the 3 corresponding extruder json files. Even removed everything in the Mark printer definition json to make it look like the custom json.
No success.
I have reproduced this, and I'm looking into it.
Could you try if adding a new printer with the same definition fixes the issue? I could reproduce the issue, but now I have made a couple of changes and I can't reproduce it anymore.
Same here. Tried to add a 3rd extruder to the Mark2 profile. Double checked all the position, default_value, maximum_value settings in the 3 corresponding extruder json files. Even removed everything in the Mark printer definition json to make it look like the custom json.
No success.
Don't forget to increase the default value for "machine_extruder_count" in the definition file.
"machine_extruder_count": {
"default_value": 3
},
I made a quick test... works for me... 
That should not be necessary (Custom FDM Printer has "machine_extruder_count" set to 1), but if it works it works ;-).
Some more tinkering is in order here. It could be an issue with cache (there's a cache in ...\AppData\local\cura\).
Cleared cash, tried with machine_extruder_count set to 3 and without the machine_extruder_count entry on 2.6.0 and 2.6.2, still no success.
I'm on OSX, you're on Windows Tinkergnome?
.. but adding another printer with the same def files works!
1
> adding another printer with the same def files works!
I think that's going to have to be the official workaround for now.
.. but adding another printer with the same def files works!
can't find the cache files on my mac
how do you mean 'exactly' adding a printer with the same def files...?!
add printer, close cura, copy paste definition json in the new printer definition json...?!
cheers / joris
no, just add the same printer within Cura once again. It will be named ...#2 and shows all extruders
Disregard what I said about cache, do what @foehnsturm says. The newly added printer will get the same profiles the old one has, including your custom profiles.
The problem you have encountered is that when a printer is "added" in Cura, a stack.cfg file is created for all possible extruders (in the "extruders" folder in your configuration folder). If you add new extruders to the definition, there will be missing stack.cfg files for the current printer, but these will be correctly created for any newly "added" printer.
If you still need help with this, drop by the next time you are in the office. I'm happy to help you set it up.
Forgot to mention: The easiest solution is not to mess around with json files at all and just use the Custom FDM Printer, which comes with up to 8 extruders
And you are welcome in my office too ;-)
Edited by GuestAdding the printer works...!
But that shouldn't stop me from dropping by in all offices....
Thanks...!
MariMakes posted a topic in UltiMaker Cura,
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ahoeben 1,986
Have you tried starting with the Custom FDM Printer in the GUI? It comes with (up to) 8 extruders.
You may have missed some changed when you edited the definitions for the Ultimaker Original Dual Extrusion.
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