I follow like 80% of the channels listed in this thread so far, so here are some more that I enjoy

https://youtube.com/@cuttingedgeengineering

https://youtube.com/@snowballengineering

https://youtube.com/@noengineerhere (but probably too much comedy for your taste)

https://youtube.com/@matthiaswandel

https://youtube.com/@agingwheels

https://youtube.com/@breakingtaps

https://youtube.com/@saveitforparts