Seed storage with M3 washers.
thingiverse
This stamping jig is for stamping Bitcoin seed words into stainless steal washers for reliable long term cold storage. It´s based on the idea of https://blockmit.com/ but just smaller. It uses M3 washers and steel stamps with 1mm capital letters. The washers need to be ISO 7093 (DIN 9021) with lager diameter, "normal" washers (ISO 7092 / DIN 433) are to small. The jig is made for steel stamps from the german company https://gravurem.de/ which feature a 6mm square cross section.
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