Diver's Lung Tester V2

Boost MeIt support my journey to more filament  Diver's Lung Tester V2 Think you've got diver's lungs? Prove it — or prank someone who thinks they do. The Diver's Lung Tester looks like a simple blow-challenge toy: blow into the mouthpiece and try to spin the wheel as fast as you can. But there's a secret second function hiding inside. How it works: Two separate air channels are hidden in the body. Blow into the main hole and it pushes flour out at whoever's face is closest — the prank. Plug that hole with your tongue and blow instead into the second channel (now hidden on the bottom, so it's harder to spot) and the wheel spins clean, no mess — the harmless demo. What's new in V2: Smoother, easier wheel spin More compact size Bigger flour blast per blow Second hole moved to the bottom for better misdirection Assembly: Fill the flour pocket, screw the lid on Slide the 3d printing standard filament dowel through the body and into the wheel— make sure it sits straight, if it's crooked the wheel will rub against the body and spin poorly Done — 3 pieces, no glue needed Tip: Hold the toy straight while blowing — if it's tilted, the wheel rubs against the body and won't spin. How to prank someone: Demo it yourself first (plug the main hole, blow into the hidden one — clean spin). Then challenge them to beat your time. Most people blow straight into the main hole and get a face full of flour instead. Print notes: 52g, ~2hr print, supports required, AMS multicolor recommended.   Video on how it works