WorkBench Fume Extractor Fan

thingiverse

After years of inhaling solder fumes and suffering from lung damage, this is what I've finally come up with. Both sides of my workbench feature fans attached to the end of 90mm PVC pipes, with the opposite end housing a 120mm fan. A small disk magnet holds the flap in place on each bench fan, securing it in the closed position. When one fan is opened, a disk magnet grabs onto a screw on the side of the pipe, holding the cover flap open and activating a microswitch to turn on the fan. To attach parts 1 to the fan, countersink the holes for screws. As the power supply moves towards the large fan end of the pipe, the big fan is turned on by a PNP power transistor. The transistor is triggered by either or both bench fans drawing current via their base/emitter junctions. When installing hinges, you may need to drill out the holes to accommodate your chosen hinge pins. I drilled the outer hinge parts on part 1 and both hinges on part 2 to 3mm, then secured them with M3 screws inserted into the plastic of the inner hinges on part 1. Don't forget to drill a magnet mounting hole in the flap to match your magnets' specifications. Special thanks go to "airforce" for creating an excellent fan cover design, which I adapted from their original work at http://www.thingiverse.com/thing:892548. For those interested, additional photos showcase closer details of this project. Print Settings: Printer Brand: Deltaprintr Printer: Deltaprintr Kit Rafts: No Supports: No Resolution: .3mm layers Infill: 100% Notes: I printed these at 100mm/sec using PolyMax PLA.