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A small carabiner and a handy tool. Includes
1/4" (screwdriver bit size), 8mm, 10mm
, and 12mm hex slots, a box opener/flathead screwdriver/pryer.
I haven't tested it as a bottle opener, but that should also work.
This design doesn't include a spring, however, there are two small holes designed to accommodate one (I found that it is best to bend one out of a large paperclip or thick wire). If this proves difficult, I can design a jig model to bend the wire around.
I have tested the design and although I have tried my best to account for variance in printing, it is possible that there may be some need to slightly file certain areas for a better fit.