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opisometer (map measurer)
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For measuring the length of curved paths on a map.
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Model information
- Source
- Printables
- Category
- Outdoor Sports
- License
- Creative Commons — Attribution
A device for measuring the length in cm of a path. The input wheel is marked in cm, the output wheel in tens of cm. Simply zero the device and then roll it along the path.
A 1:50000 map is two cm per km.
For axles I used some 1.75mm filament. The holes are undersized and will need to be opened to final size with a drill.