Golden Ratio Seahorse Gears. Animated GIF: http://i.imgur.com/9HVIzAV.gif Inspired by Nautilus Gears by MishaT: http://www.thingiverse.com/thing:27233 Update 9/8/14: I added a new smooth running seahorse gear version (v3). The new version does not latch into a closed position and is suitable to drive with a motor, etc. To clarify, choose the version of the gear based on desired action. Gear v2 - Latching Gear v3 - Smooth running Enjoy! Update 6/9/14: Added DXF files, so hopefully people with laser cutters can try this out too. Update: 2/27/14: New Version (2.1) of the arm. I replaced the pins with simple holes. Use raw 1.75mm filament for the pins/rivets, using the methods described here for using rivets as hinges. Look at the section titled 'USING FILAMENT TO MAKE SOLID RIVETS AND HINGES' towards the end of the article : http://makezine.com/projects/make-34/skill-builder-finishing-and-post-processing-your-3d-printed-objects/ I used a lighter instead of a heat gun. It's quite easy and much stronger than a printed pin. Update 2/26/14: New Version with stronger pins.... is a failure. Pins do not mate properly. I have a new vetted design with a simpler pin made from a raw filament 'rivet'. I'll post updated files and instructions on 2/27/14 Update 2/26/14: New Version with (hopefully) stronger pins. Units are now in Metric. Print two identical gears and one Left & Right side arm. For a nice texture use 'Hilbert Curve' for the first and last layer of the seahorse gears. Use raw 1.75mm filament for the pins/rivets, using the methods described here for using rivets as hinges. Look at the section titled 'USING FILAMENT TO MAKE SOLID RIVETS AND HINGES' towards the end of the article : http://makezine.com/projects/make-34/skill-builder-finishing-and-post-processing-your-3d-printed-objects/ I used a lighter instead of a heat gun. It's quite easy and much stronger than a printed pin. Note: The 'assembled' file is not set up to print in place. It is for visual reference only.