Hairpin cotter pin rubber safety wire / Lanyard.
thingiverse
I have a company who rent out machines and trailers. I had a problem connecting a metal chain to my cotter hairpins. And the hairpins was always gone when customer came back. Steel chain and ring always slide off and got rusty. Often swing and damage then paint job on my machines / Dashboard. So i designed these "rubber chains" / rubber Lanyards. It fit a Ø3mm and ø4mm hairpin cutter. But it is easy to scale it up or down. There is also a small "chain" to use with a keyring. I made them so big i would just fit inside my Untimaker 3 I printed mine out using Ninja-flex on my Ultimaker 3 Using no support and no brim. Ninja-Flex is really strong and flexible. Set "wall Line Count" so high you do not get "zik zaking" in a layer for the "C" around the pin. I had trouble printing with Ninja-flex until i bought a " PTFE Bowden Tube"
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