This is a work in progress
It's tricky to print a balloon rocket car due to the wheels and axels. So I figured "why not use the LEGO wheels we already have?"
Basically this is the mechanism for a typical balloon car but embedded into a custom LEGO-compatible body, so you can just snap it on to whatever LEGO vehicle you want.
Place a standard balloon over the lip of the "pipe" on the top. Blow through the rear nozzle to inflate.
I'm still working on variations - my goal is to showcase the differences in nozzle size for instance, so they can be used to help kids understand Newton's laws etc.
Brickable_Balloon_Engine_1_-_Tube.stl | 147.8KB | |
Brickable_Balloon_Engine_2_-_Cone.stl | 155.6KB |