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
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ahoeben 2,026
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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