Dual extruder feed issues

[Hauke]

…and also be aware of the heat creep problem some users have:

Dual Extrusion Head: Heat creep discussion thread

Hi folks, on facebook (and I seem to remember here also) there are a few users assuming that they suffer from heat creep, some (here a picture stolen from Facebook user Nand Maas) going to extreme measures: [grafik] I honestly doubt it. On the one hand, even the shown picture did not yield success, and, on the other hand, the general construction of the hotend does strike me as rather sound, better even than the single extruder head. The problem people report is nozzle clogging, accompanied…