How do I make one part with 2 different types of filament using the dual extruder v3? How do I do that in Cura? Is it even possible?
Yes.
Import the two STLs and assign each a filament material in Cura.
Start reading from Step 14 of the DualExtruder v3 installation guide:
https://ohai.lulzbot.com/project/lulzbot-taz-dual-extruder-tool-head-v3-install/accessories/
Those models are designed in two parts that can be merged together as kcchen_00 described in his post. Here is a good example model: https://www.thingiverse.com/thing:21773
We have a handy dandy little write up to help people get started doing dual color prints here: https://www.lulzbot.com/learn/tutorials/tips-and-tricks-dual-more-dual-extruder-v3
If you want to print a dual color print out of an STL that is a single part the only way to do it is to pause the print and switch the filament when you want a color change. You could also try splitting the model into parts yourself but that requires a decent amount of modeling software prowess in my experience.
thank you very much this is just what I was looking for