Oscillating twin-cylinder steam/air engine.

by denisc, published

Oscillating twin-cylinder steam/air engine. by denisc Dec 4, 2014
3 Share
Download All Files

Thing Apps Enabled

Order This Printed View All Apps



Liked By

View All

Give a Shout Out

If you print this Thing and display it in public proudly give attribution by printing and displaying this tag.

Print Thing Tag


Thing Statistics

9930Views 3129Downloads Found in Mechanical Toys


This is working toy/model of twin-cylinder oscillating/wobbler steam engine.
I have developed it just for fun.
It's designed in OpenSCAD and almost fully parametric.

The model almost fully plastic only two m3 x 10 allen screws required for connecting two parts of fly wheel.


Edit 6-dec-2014: Slic3r settings screenshorts added.


I have printed all parts of the engine with 0.1mm line thickness.
Sliced by Slic3r.


  1. fly_wheel1
  2. fly_wheel2
  3. connecting_rod - 2
  4. cylinder - 2
  5. piston - 2
  6. plate - 2
  7. stand
  8. nipple nut - 2
  9. nut - 4

Clearances may be too small.

Sanding may be required for the following pairs:

  1. piston-cylinder
  2. connecting rod crank - fly whell crankshaft
  3. fly wheel axle - plate hole

Use two m3x10 allen screws to connect fly_wheel1 and fly_wheel2

Assembling: http://youtu.be/tcfEYyH4UNw

More from Mechanical Toys

view more

All Apps

3D Print your file with 3D Hubs, the world’s largest online marketplace for 3D printing services.

App Info Launch App

Auto-magically prepare your 3D models for 3D printing. A cloud based 3D models Preparing and Healing solution for 3D Printing, MakePrintable provides features for model repairing, wall thickness...

App Info Launch App

Kiri:Moto is an integrated cloud-based slicer and tool-path generator for 3D Printing, CAM / CNC and Laser cutting. *** 3D printing mode provides model slicing and GCode output using built-in...

App Info Launch App
KiriMoto Thing App

With 3D Slash, you can edit 3d models like a stonecutter. A unique interface: as fun as a building game! The perfect tool for non-designers and children to create in 3D.

App Info Launch App

Print through a distributed network of 3D printing enthusiasts from across the US, at a fraction of the cost of the competitors. We want to change the world for the better through technology, an...

App Info Launch App

Quickly Scale, Mirror or Cut your 3D Models

App Info Launch App

3D Print a wide range of designs with Treatstock. Easy to use tools to get the perfect result. The global 3D printing network that connects you with high-quality and fast working print services nea...

App Info Launch App

Printed the pistons and cylinders. Unfortunately to tight, not fitting together.

Piston diameter lower then cylinder on 0.1 mm. Sanding.
Also, you can change `piston_clr' variable in engine.scad. It's radial clearance.

the nuts came out too small for me. I am going to try and scale them but I hope everything else comes out okay. Now I am finding that everything is out of scale.

The nuts diameter already have a clearance 0.34mm (piston_screw_clr * 2).
Probably you have an over extrusion.
If you interested in clearances values then look at source code (file engine.scad) - search variables with '_clr' suffix.

The spring part is impossible to slice in Simplify3D. Cuts the spring.

Just use Slic3r.

You have to minimize friction.
"It never seals compression when blowing" - it's true. The key is minimize friction.
I didn't use any grease.

I spent several hours sanding and applying graphite, it will not rotate when blowing as shown in your video. I will try with air compressor. It never seals compression when blowing in either side and rotating the crankshaft. Any advice?