Zheng3 Tinkeriffic Gear Train
thingiverse
Revitalize old toys using this intricate gear train! The gears are available in male, female, or male/female versions to ensure smooth operation. Their chunky design allows little hands to easily grasp and manipulate the playset. Currently, you can purchase it on Shapeways (http://bit.ly/NapVP5) or learn more about it on Zheng3's blog (http://www.zheng3.com/2012/06/16/switching-gears/). This gear set requires no assembly - simply print and play! To ensure proper fit, the gears' bores should snugly fit a 1cm shaft while still allowing children to easily attach and remove them. Adjustments can be made using sandpaper or masking tape. The gear ratios are 32, 16, and 8 teeth respectively; calculate the ratios yourself for added challenge.
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