We’ve had our eye on [Greg Zumwalt]. He’s been engaged on some very intelligent 3D-printed mechanisms and his newest prototype is an air engine for a toy car. You may provide the air for the one cylinder with a compressor, or by blowing into it, however attaching an inflated balloon makes the system self-contained.
Final week we noticed the prototype of the engine by itself, and questioned if this had sufficient energy to drive a little bit prepare engine. We had been nearly proper as right here it’s powering the entrance wheels of a little bit automobile.
This isn’t [Greg’s] first rodeo. He’s been engaged on self-contained locomotion for some time now. Proven right here is his spring-driven car which you pull backwards to load the spring. It’s a typical function in toys, and really neat to see with the included 3D-printed spring hidden inside the widest gear.
That print appears to be like spectacular, however the balloon-powered prototype tickles our fancy fairly a bit extra. Be sure to have your sound on while you watch the video after the break. It’s the chuga-chuga that places this one excessive. [Greg] hasn’t but posted recordsdata so you’ll be able to print your individual (it’s nonetheless a prototype) however browse the remainder of his designs as you wait — they’re quite a few and can deliver a good larger smile to your face. Keep in mind that domino-laying LEGO bot [Mathias Mandel] constructed a number of years again? [Greg] has a printable model for it!
Filed underneath: 3d Printer hacks, transportation hacks