The file '4040 Aluminium Extrusion 45° Connector 3D Printer Model' is (stl) file type, size is 500.4KB.
4040 45° Aluminium Extrusion Connector
The aluminium extrusion needs an M8 threath in the end.
I used a M8 countersunk head screw to fix the connector
4040_Nut_8_45_Grad.stl | 1.3MB |