K40 laser cutter 4 inch exhaust port

thingiverse

I print at 100 percent infill for maximum strength. No supports. Many of the holes for the plastic nuts are designed to be tapped 1/4 20 so they may be slightly too small. Drill them out or tap them. The 4 inch silver vent hose I bought doesn't fit the fan so I made an adapter. It comes in two sizes. Use duct tape to tape the ducting. That's exactly what its designed for. Assembly: 1. Install inner metal air duct using original screws and nuts. Except put the nuts on the outside of the machine. GENTLY finger tighten them. 2. Facing machine from the rear. Remove leftmost nut and install flat plate(cover.stl). 3. Remove top nut and slide the main square vent piece(tower.stl) onto it and lightly tighten nut down with fingers. You have to put your other hand through the end of the vent and use your fingers to hold the screw in place. 4. Repeat for the right and lower side. It can be difficult if you have large hands. I am an adult male and was able to do it but I have small trump sized hands. 5. Install square end piece(top.stl) with glue/sealant and printed nut/bolt(quarter20nuttest3.stl). 6. Install round vent adapter(ring.stl) with glue/sealant and printed nuts/bolts. The entire thing was designed to use minimal amounts of plastic so if you want anything thicker/stronger open the .rsdoc file in DesignSpark Mechanical and change away.