I like to change my guitar pedalboard around fairly regularly, and because of this I tend to leave spare DC plugs connected to the power supply. Because so many pedals use the Boss-style positive-barrel / negative-centre DC plugs, that means anywhere between 9-18v is floating around on the board, ready to short out against whatever it can in the middle of a live gig. This little cap solves for that.

There's a little spring loaded tongue inside which makes it a perfect press fit - at least on my plugs! I use ones that came with a MXR powerbrick and CIOKS DC-10 but I'd expect they'd work on most plugs. If you need a longer barrel let me know, happy to adjust it.

I print these in PLA with a 0.4 nozzle.