Edge Connector Keying Insert (C64 User Port)
thingiverse
These inserts can be used to key edge connectors like those required on the user port or cassette port of the Commodore 64. Properly keyed connectors will fit the correct way only and can no longer be reversed accidentally. The dimensions of individual connectors will vary slightly by fractions of a millimeter. That is why I have included different versions of the insert with widths of 2.2mm, 2.4mm, and 2.56mm, respectively. Some trial-and-error will probably be required to find out which one will fit your connector when printed on your printer.
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