I am very satisfied with the double extruder.
TPU also prints perfectly.
What print settings did you use? My machine can barely print in two colours
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Would love to know your workflow. Whenever I tried the dual-extruder with anything other than support it messed everything up (lots of stringing and leftover filament on the next layer)
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These are my print settings for PLA Black and PLA White. For both, I also set the flow in Luban to 98% under material settings. I use the settings for TPU. With a flow of 96%. When loading TPU, I go to 245-250 degrees with the Nossel. Because otherwise I always get knots. I also always feed the filament into the extruder by hand to make sure it is properly inserted. Only then do I close the flap and operate the shutter.
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I always use the Prime Tower. I keep the withdrawal at PLA at about 1-1.5. When breaking PLA at about 2.5. With TPU at approx. 1.
Sorry for my lousy english. Google Translator. 
I mostly use Luban. But I also use Cura and Simplify 3D. Every program has its strengths.
Settings for TPU in Luban
I did some more playing around with my machine and I still can’t print in two colours (each extruder prints fine on its own.) Did you mess around with the retraction settings at all?
