So… the Dual Extruder V2 came in the mail today. It’s a monster… its looks to be well built upon first inspection. For the most part it looks like it well do well for dual color printing of the SAME filament. Because of the fan duct system, it may not do well in mixed filament prints which require different fan cooling characteristics.
Here’s a picture of the bottom of the extruder:
There are two fans which can be independently controlled. The issue is the fan ducts. Each duct cools BOTH hotends. Ideally each fan would independently cool the left and right side of each hotend.
So if printing different filament types in each extruder, the options are to block one of the duct port so that only one hotend is cooled by the associated fan or to redesign the ducts so they wrap around the hotend… which would make changing the nozzle more difficult.
I have mixed emotions about this. I have the utmost respect for Lulzbot and the engineers. While this seems like a minor over-sight… it doesn’t demonstrate the expertise I’d expect. I hope the folks at Lulzbot re-visit the duct design for the Dual Extruder v2.