Printbuchse - alternative connector socket for fischertechnik cables

Update 2025-Feb-09: added jack adapter version for the newer ft-jacks with shorter pins.

The [fischertechnik](https://www.fischertechnik.de/en) construction toy system uses cables with unusual [2.6mm jacks](https://ft-datenbank.de/ft-article/1733). Compatible connector sockets, so called "[Bundhülsen](https://fischerfriendsman.de/index.php?p=7&sp=3#R7144)" (flush sleeves) are hard to get, relatively expensive, and you have to drill holes in your PCBs to mount them.

My "Printbuchse" (printed so