Erik replied Sep 3, 13:19
Thank you for reaching out to us and thank you for your kind words with MatterControl! We are stoked to hear you love it!
Assuming you have your printer profile to operate with dual extrusion, assigning extruder one and two is easy!
When you drop in a model, on the right-hand side you will see options like width, depth, height along with color and material. Select the Material button and assign it to either one or two. (I have attached a screenshot to help aide you in this).
From there, I would go into Slice Settings> Extruder Change> Wipe Tower Size> (I use 15mm). To make sure the material you want is flowing properly out of the head.
To be honest, however, I have not used that hotend you are using before but even still, this should do the trick.
I hope this helps!