Hi Lulzbot Users!
With the release of our overwhelmingly exciting Dual Extruder, one of the biggest questions everyone has is, “Where are the fans?!” Well, the original design did not take fans into account, so I’ve been working on a design fusing Lulzbot’s lower bracket for the dual extruder (http://devel.lulzbot.com/TAZ/accessories/dual_extruder/dual_extruder-1.0/stl-gcode/Lower_Bracket/Lower_Bracket-V1.1.stl) with American3dPrinting’s dual-duct fan mount (http://www.thingiverse.com/thing:374906), and the result is the Dually Cooly
2014-11-20 Dually Cooly 8.stl (1.34 MB)
Simply replacing the standard lower bracket, the DC allows you to attach two standard 40mm 24v fans, one for each extruder, that blow air to the heat sinks and also to the nozzles as they print. This has the most impact when printing with PLA, which otherwise can be a challenge due to heat creep and surface cooling issues. The DC will also aid in printing with HIPS, T-glase, and other materials that do well with some cooling during printing.
The DC prints sitting flat and needs no support, thanks to the two vertical supports inside the fan mounts. Holes on the top of the E0 fan shroud allow you to insert the whole M3 screw down into the holes and through to their mounting points on the Dual Mount bracket. Sizing of the holes on the fan mounts are ideal for heat inserts that you mount the fans to, but with some acetone to adjust the holes you can self-tap some M3 screws in. Perhaps a second design for self-tapping would be helpful.
This is my eighth iteration of the Dually Cooly, and there are still many improvements to be made. I appreciate any and all feedback and testing.