These types of aluminum extrusions have been used for many years (at least in Europe) in many industries to build all kinds temporary to more permanent structur

These types of aluminum extrusions have been used for many years (at least in Europe) in many industries to build all kinds temporary to more permanent structures [1]. Also the reason they ended up in 3d printers as they have been used in other CNC type setups. Oddly enough the Wikipedia article is very thing and not even available in English [2] [1] https://www.kanya.com/fileadmin/_processed_/3/1/csm_kanya-ag-loesungen-aluprofile_2c7e1205c0.jpg https://www.kanya.com/fileadmin/_processed_/3/1/csm_kanya-ag... [2] https://de.wikipedia.org/wiki/Konstruktionsprofil https://de.wikipedia.org/wiki/Konstruktionsprofil (German)