Punched tape reader hack, door lock system, 20% cooler hinged polygons

 

 

https://ruum42.ch/
https://ruum42.ch/paper-tape-reader
https://ruum42.ch/paper-tape-puncher
https://ruum42.ch/schlosssystem

https://ccczh.ch/
https://ccczh.ch/wiki/Fillygons
https://git.ccczh.ch/3d-printing/fillygons