And now I need to make a 3D printed mold in a comfortable shape that can be used to easily cast concrete around a lighter.

Maybe a simple cylinder, with the lighter off center so it can easily be flicked?

Maybe I’ll squish some play-doh around one and scan it and use that.

Whatever, it just needs to be too big to “accidentally” end up in someone’s pocket.

Wow. Same for me. Digg just before the implosion, then reddit for 10ish years then here. 52.