Superman Dual extruder Tri-colour trick

Misc Notes
Merge dual colour model in your slicer by selecting them both and clicking "merge" after selecting a different extruder for each model.

3 Colours from 2:
This is one single print with 3 colours from a dual extruder, by using a hot swapping method. No need to pause print. When the blue is finished printing and it starts to print red (about half way up), turn your print speed right down while you pull out the blue filament and put yellow in. I screwed this up by pulling it out a l