Napier's Bones (Manual Calculator)
thingiverse
John Napier's calculating device, known as Napier's Bones, simplifies multiplication and division by utilizing embedded tables for additions and subtractions. Its efficiency cannot be fully described in words; visit http://en.wikipedia.org/wiki/Napier%27s_bones#Example_1 to see examples of usage. Additionally, when printing the bones, they can be printed either way up, although some prefer upside down for clarity on a smooth glass bed. It's even possible to pause and switch filament color mid-print for better digit contrast. Since certain calculations may require the same bone multiple times, it is suggested to print duplicates of each bone. Again, refer to http://en.wikipedia.org/wiki/Napier%27s_bones#Example_1 for usage examples.
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