by whowhatwhere, published
An ancient astronomical instrument used in navigation - More complex ones also had mathematical functions.
I'm interested in making precision devices with my makerbot and this seemed like a good place to start - This is version 1, if it prints OK then I will progress with other versions with more features (such as a circular slide rule)
I'm posting the sketchup files in case anyone would like to modify, or improve the design (I'm new to 3d modeling so it's pretty crude)
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This model is untested.
Warping may be an issue with such a large flat object.
2 STLs, 1 for the main disk, and 1 for the center peg and the observing arm.