My redesign based off the Proteus Key Holder by ProteanMan. I wanted a round look like an original swiss army, and I wanted to use US measurement screws and nuts because they're just easier to source.
80mm long (without the loop). You'll need 3x #4 screws and nuts. You'll also want washers that fit this size. The length of the screws depends on the number of keys you want to use, Photos show 3/4" screws with a washer between each key. I fit a total of 6 keys, 3 on each side.You'll also want some Loctite or super glue to keep the nuts in place.
I've uploaded a blank design or my Jolly Roger. I also uploaded one version with no loop for attaching to a keychain, in case that's useful. You'll want to print one top and one bottom, your choice of style.
Designed in Fusion360
I'd love to see pictures of any makes
20% (More if you want extra weight)
See the comments and instructions on ProteanMan's original design for more ideas.
Place a washer between each key, and between the keys and the body. Tighten down the screws, but don't over tighten. Put a drop or two of Loctite or super glue to keep the nuts in place. The washers allow the keys to move freely even with a tight screw.