Air Motor - Prints Fast - Runs FASTER!

Bring mechanical motion and pneumatics to life with this fully functional 3D printed single-cylinder wobble air motor! Perfect for STEM projects, science fairs, classroom demos, or hobbyists, this model is designed to be educational, fun, and impressive.

Key Features:

• 5-Part Snap-Together Design: Frame, Crankshaft, Flywheel, Piston, Cylinder – no screws, bolts, or glue required. 
• Easy to Print: Designed for PLA but works with any filament. 
• Efficient Printing: Complete in ~3 hours 32 minutes using only 4.7 oz of filament. 
• No Fittings Needed: Simply hold an air nozzle to the tapered inlet port, and watch it spin. 
• Fast and Smooth Motion: Spins quickly at just 40 PSI, providing a visually impressive mechanical demonstration. 

Why This Model Stands Out:
This 3D printed air motor is perfect for STEM education, helping students and hobbyists explore mechanical engineering, pneumatics, and rotational motion. Its snap-together assembly makes it easy and satisfying to build, making it an excellent hands-on learning tool.

Perfect For:

• Science fairs and STEM competitions 
• Classroom and educational demonstrations 
• DIY makers and 3D printing enthusiasts 
• Office or home desk gadgets and conversation starters 

Take Your STEM Projects Further:
Follow me to explore my 2-cylinder V-style air motor, a self-starting, more advanced design that’s even more dynamic and visually impressive, making it a perfect STEM project or decorative conversation piece.  Find it here:  

https://makerworld.com/en/models/2476633-fully-working-3d-printed-air-motor-high-rpm#profileId-2719907

Assembly Instructions:

First off be careful when removing the support on the cylinder spring loaded pivot and the crankshaft.

Next, install the cylinder to the frame front by gently pressing the pivot pin into the pivot hole.  The 4 segments will compress and when pushed all the way through the frame, snap into position.  Now take the cylinder in one hand and the frame in another and rotate the two against each other for 30-60 seconds.  You will feel the cylinder pivot loosen up.  Once it is nice and loose, remove the cylinder by carefully squeezing all 4 tabs and pulling the cylinder off the frame.  You are now ready to assemble.

Step 1:  Insert the piston into the cylinder.

Step 2:  Insert the crankshaft pin into the piston (note:  My pictures I posted show all these steps)

Step 3:  Pass the crankshaft into the frame until the cylinder is up against the frame.

Step 4:  Press the segmented cylinder pivot into the frame as you did for the breaking in procedure, until it clicks into the locked position.

Step 5:  Line up the hex hole on the flywheel with the hex shaft end on the crankshaft.  Press the flywheel onto the crankshaft.  It may help to put a thumb on the piston end of the crankshaft.  It is important that you press straight down the shaft.   Do not hold onto the piston or you will break the crank section off.  You can also place the cylinder end of the crankshaft on the edge of a countertop and press the flywheel straight down until flush or nearly flush.

That's it!  Did you time yourself?  The only thing left is to print more for your friends!