Machining

This Old Tony (Home machine shop)

ClickSpring ( Ancient tool making )

Oxoolco (Tool making and machining)

NYC CNC (CNC, machining, shop tours)

MrPete222 (Classic home shop guy)

All about welding

The corvette guy (CNC, micro manufacturing)

More here

Projects about plastic & recycling

YouTube.com/rubbishreads (for kids & teens)

Eletronics

All about PID controller wiring

All about making filament

Making a filament extruder

Solar collector