Barrel cooling duct for MendelMax 2 & JD Duallie Belt Driven Extruder

thingiverse

I was having heat creep issues in my J-Head barrel during dual extrusion that wouldn't be a problem with single extrusion either. It is recommended to cool the barrel anyway. I designed this to fight that problem. I also wanted to prevent intake and exhaust turbulence from cooling the part. This is designed around the J-Head hot ends, it would work with hot ends with a 16mm diameter barrel. I intended this for use with ABS and other materials where cooling the part would be unwanted. For PLA, you need another fan to cool the part after it is laid down. Instructions I designed this intending for 0.5mm line width. So a 0.4mm or smaller nozzle is recommended. You will probably need to tap the MM2 carriage, I used M4, M5 and M6 taps for the various holes. You will also need some miscellaneous M3, M4 M5 and M5 hardware. I apologize for the eclectic mix of hardware needed, but that's what ended up working given the mount plate in question. All screws I chose are pan head screws, Phillips drive. Others will work. If you tap like I suggest, these screws are needed: 2x M6 x 8mm (or 10mm, 12mm with flat washer) for the rear side mounts 1x M5 x 8 for the rear center mount 4x M4 x 8mm, 10mm or 12mm long pan head screws for the front side mounts plus to screw the front and rear sections together 2x M3 x 6mm (or longer, 8 and 10mm will secure the top fan shroud) 4x M3 x 18mm screws to mount the fan & intake to the rest of the ducts.