Edge Precision - heavy duty CNC machinist https://www.youtube.com/channel/UCCkSr3M8GXbS4txqPY7OMxQ
Essential Craftsman - construction, tools, etc. Has a great new series where he is walking through the entire construction of a home, dubbed the "spec house" https://www.youtube.com/channel/UCzr30osBdTmuFUS8IfXtXmg
Frank Howarth - woodworking https://www.youtube.com/user/urbanTrash
Matthewmatosis - long-form video game analysis https://www.youtube.com/user/Matthewmatosis
NurdRage - incredibly interesting high level chemistry (to me at least). Has a really great series where he finds a new way to make Sodium Metal. https://www.youtube.com/user/NurdRage
RR Buildings - post-frame construction, tool reviews https://www.youtube.com/channel/UCWXEQsK3UiHszjwgGN5HUeQ
This Old Tony - machining, welding. Very funny! https://www.youtube.com/user/featony
Vancouver Carpenter - mostly drywall tips. Offers very clear explanations of how to do various drywall jobs https://www.youtube.com/channel/UCbZdXox6mKHdcT2QdVT-goQ