Air Balloon Motor for LEGO

Updated, more airtight and better running version can be found on the MakerWorld: 
https://makerworld.com/models/1783606-air-balloon-radial-piston-engine-v2


Demo and assembly guide: https://youtu.be/5G4Wwa94\_aM
Exploded view in 3d viewer: https://skfb.ly/6QL8R

Extra parts needed:

• Nitrile glove

Air balloon
Takes 4m of filament to print (about 5h at 20mm/s on my snail of a printer).
Will print a bit prettier with supports (80deg. overhang, touching buildplate) and ironing.
Parts with names starting with "X_" are optional.

You can insert one balloon into another to get thicker walls. Meant for 2-walled balloon. Idles well with one (with a flywheel), but will hardly pull any vehicle.

• You can use metal M5 washer instead of printed one
• Found that PLA isn't the best material for the design: isn't very slippery, and "fluid" (the clips stop pushing the parts together with time)

Print instructions

Category: Engineering Print Settings

Printer: AM8

Rafts: No

Supports: Doesn't Matter

Resolution: 0.2

Filament: Bestfilament PLA Gray