Ken-Nawa (measuring rope)
thingiverse
This is a measuring tool used by Inou Tadataka in Japan about 220 years ago. He carried out surveying all land of Japan to complete Map of the whole of Japan. You can 3D-print two of them and bond them together. reference: https://www.culture.city.taito.lg.jp/bunkatanbou/culture/kahaku/japanese/page_05.html
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