Rack and Pinion Fidget Toy
thingiverse
To complete this model, you will need a length of 1/4 inch dowel, or any other rod measuring exactly .25" or 6.35mm in diameter. All the remaining components can be printed using a 3D printer. Check out this video on YouTube: https://youtu.be/4MQ8kSPjICo This model is based on an old device that converts constant rotary motion into back-and-forth motion. The original device can be found in "507 Mechanical Movements" at http://507movements.com/mm_114.html. Here's a video explaining how I created this 3D model using Rhinoceros: https://youtu.be/aDYaTnC2fpg
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