Miele Kranz Round sockets and switches

https://kranz-design.ru/catalog/round/ 

System units cm

Turbosmooth modifier applied to Render iters 1

For convenience, auxiliary objects are made on the frames. It is enough to align the socket with this object along all axes and turns so that the element is set correctly.

For Corona render, it is recommended to install version no lower than 1.5, since the glossiness of materials is configured taking into account PBR

Those who work in V-Ray version lower than 3.1, be careful, in the materials in the BRDF section there is Microfaset GTR (GGX), if your version is older than 3.1, then the BRDF field will be empty. Select Blinn, Phong or Ward - what is preferable for you

Corona Renderer 6
Vray 5 (Update 1.3)