J-Head Dual 40mm Fan Cooler

thingiverse

Note: Due to inherint flaws in this design, I developed an alternative modular cooling system for the Prusa i3 that can be found at http://www.thingiverse.com/thing:230654. I suggest checking it out before you make one of these. This is a dual 40mm fan filament/J-Head nozzle cooler for the MakerFarm Prusa i3 with an MK IV J-Head hot end and a Greg's Accessible Extruder, although it should work with most Wade's/Greg's extruders using the MK IV J-Head. It provides 330 Degree cooling of the filament. One fan is dedicated to cooling the J-Head, the other is dedicated to cooling the filament. I have added a mirrored version of the DualFanFlowDirectors360.stl file, to allow the use of 40mm X 40mm X 20mm fans for filament cooling in place of the 40mm X 40mm X 10mm fans, since they were previously obstructed by the extruder stepper motor. Instructions Each of the 4 pieces were printed separately. The DualFanFlowDirectors360 part was printed with a 0.35mm nozzle at 0.3mm layer height. Smaller layer heights seem to help this part to print more successfully given some of the steep overhangs. After each part was printed successfully, the DualFanShroud, DualFanFlowDirectors360, and the FilamentCoolingDuctDifuser were super glued together. The DualFanMount should snap onto the J-Head, and has holes for the screws that go into the extruder (Greg's Hinged Accessible Extruder in this case). If printed correctly, the DualFanShroud should snap into the DualFanMount, and the FilamentCoolingDuctDifuser should encircle the nozzle of the J-Head. NOTE: This cooling duct will not work with the J-Head MK-V! It is designed for the MK-IV, which is 10mm longer than the MK-V.