The file 'Ender 3 Lightswitch Box 3D Printer Model' is (stl) file type, size is 92.4KB.
To mount a Light Switch to the 40 x 20 Extrusion
Build for this kind of Switch:https://www.reichelt.de/wippschalter-tastend-1x-ein-schwarz-wippe-1801-1202-p108232.html?&trstct=pos_1