Updated version (crankshaft doesn't block the exhaust anymore) can be found on the MakerWorld:
https://makerworld.com/models/1801690-balloon-powered-radial-engine

Run by just blowing air into it. Demonstration:
https://www.youtube.com/watch?v=\_FDZzKAFSz4

Exploded view in 3d viewer:
https://skfb.ly/6LQBR

If you like how it works, you can support me by purchasing the Pneumobile chassis:
https://gum.co/pneumobile (3d Viewer: https://skfb.ly/6LV6D)

Works with this remote:
https://www.thingiverse.com/thing:3675568
Or with simpler remote from the Vapemobile set:
https://www.thingiverse.com/thing:3606204

Extra parts needed:

M3x8 Bolts (x15)
M3 Nuts (x15)

Nitrile Gloves (thumbs from M sized gloves worked the best)
or Silicon (worse) or PET (not tested) ones
Optional parts:

M3x12 or longer bolts (2x)(for the gears)

M3 Nuts (x2)(for the gears)
6x4mm Silicon Pipe (can be found in aquarium shops)
M5x10mm Washers (x2) (instead of printed ones)

105ZZ Bearings (x2) (noticed no difference in performance)
Printed well with 0.6 nozzle at 0.2 layer height. Some parts (Cylider_Back_Lid and Valve_Lid_6mm) need supports. After printing cut away the brims from Cylinder_Ring parts.

Parts with "X_" in their names are optional.

Assembly:

Use 3d diagram as a guide: https://skfb.ly/6LQBR

Cut off a glove finger tip (thumbs from M sized glove worked well)
Pull it onto a Cylinder_Ring (Use Helper_Finger to leave enough height)
Connect a Piston to it with two Washers
Clamp the Cylinder_Ring between Cylinder_Plate and and Cylinder_Lid
Clip them with Helper_Clamp so they won't fall apart at once
Bolt them together to Plate_Top
Repeat for the other 2 cylinders
Insert th Crank with 2 Washers
Fix it in place with Frame_Bottom
Bolt all the parts together
Put the Valve_Inner in place
Bolt the Valve_Lid into place

The engine should be running!
Troubleshooting:

Rotated freely by hand, but struggling when working - the inner valve may have too much friction against the frame (sanding the valve and the frame may help for a while).
Jams on a certain cylinder - this glove finger may need a bit more slack.
Isn't rotated freely by hand - gears bolted too tightly to frame (should have a bit of play), some gear teeth didn't print very well, or the whole gear printed with "elephant foot" and runs too tight with another gear.

Print instructions

Category: Mechanical Toys Print Settings

Printer: Anet AM8

Rafts: No

Supports: Yes

Resolution: 0.2

Infill: Solid

Filament: Bestfilament PLA Dark Grey

Balloon Powered Radial Engine

by Slava Z. · original on Printables ↗

Learning / Engineering

♥ 566⬇ 878🖨 8 prints

License: Standard Digital File Licensemotorsteamgearsmechanicalmechanicaltoyairsteampunkworkingenginecylinderpneumaticradialthingiversesimplecompressedairairpoweredballoonpowered3cylindercompressedpneumatics

Print profiles

piston_x3_25431.stlDEFAULT
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cylinder_ring_x3_25431.stl
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valve_inner_25431.stl
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valve_lid_balloon_25431.stl
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x_pulley_25431.stl
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x_gears_1to8_2_bevels_25431.stl
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x_6mm_to_tap_water_25431.stl
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x_6mm_to_whistle_25431.stl
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crank_for_m5_washer_25431.stl
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gear_center_25431.stl
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gears_1to8_1_25431.stl
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gears_1to8_2_25431.stl
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frame_bottom_25431.stl
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x_cylinder_ring_02mm_gap_25431.stl
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gears_1to2_25431.stl
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cylider_back_lid_x3_25431.stl
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x_valve_lid_6mm_vert_25431.stl
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piston_washer_x6_25431.stl
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x_valve_lid_6mm_flat.stl
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washer_m5_x2.stl
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x_gears_1to8_2_bevels.stl
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cylider_back_lid_x3.stl
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helper_finger_height.stl
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frame_bottom.stl
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gears_1to2.stl
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gears_1to8_1.stl
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x_pulley.stl
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cylinder_plate_x3.stl
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x_valve_lid_6mm_flat_90.stl
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piston_washer_x6.stl
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gears_1to8_2.stl
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helper_cylinder_clip_x2.stl
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x_valve_lid_cartridge.stl
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valve_lid_balloon.stl
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x_crank_for_105zz_bearing.stl
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x_2_balloon_cartridge.stl
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piston_x3.stl
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gears_1to3_1.stl
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gear_center.stl
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x_6mm_to_tap_water.stl
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x_6mm_to_whistle.stl
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gears_1to3_2.stl
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valve_inner.stl
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x_cylinder_ring_02mm_gap.stl
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cylinder_ring_x3.stl
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frame_top.stl
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crank_for_m5_washer.stl
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x_valve_lid_6mm_vert.stl
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A_ALL_PARTS_ON_PLATE.stl
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