K40 stock exhaust fan mod (suck vs blow)

This is the first design I have uploaded to Thingiverse. I am a complete noob at CAD and used TinkerCAD to construct this. I try to keep my hobbies as cheap as possible so it will force me to use my mind instead of my wallet. The goal here was to use the crappy exhaust fan that comes with a K40 laser instead of buying something new. I wanted to make the fan suck the fumes/smoke out of my K40/hose instead of blowing them through the hose. The hose will press fit onto the adapter which has flat si