Trickle ventilation extractor cowl

thingiverse

I didn't want to drill a hole in the wall for fume extraction from my printer enclosure, so this cowl allows me to use a double glazing trickle vent as the outlet instead. It's also reversible, just in case I don't own the room where it will be installed. The pipe is a PU Flexible Ducting Hose with an ID of 50mm, which is easily available everywhere. There are two cowl designs: a plain one and a longer version with a rim at the bottom. The length doesn't matter because you'll need to split the print for most printers anyway, and then you can make more centre sections to adjust the length as needed. After splitting the print, the set of parts is glued back together to create the cowl. The lipped design provides a surface for double-sided tape to attach the cowl to the frame's surface below the vent. I've also uploaded a 50mm bulkhead fitting for the enclosure that's specifically sized for a 40mm axial fan. If I were doing this again, I'd probably choose a larger fan size, maybe an 80mm one, since the 40mm fan only produces a small flow down about 3 meters of pipe.