Second Primitive Technology (don't forget to turn on the captions). Don't recommend Technology Connections to be honest (a lot of talk to the camera, I prefer videos that show things that can't be conveyed via text).

Here's the channels I like, in no particular order:

- https://www.youtube.com/@TechIngredients Thumbnails and titles are clickbaity, but don't let that fool you. One of the most thorough channels. Polymath like Applied Science.

- https://www.youtube.com/@HuygensOptics Optical Systems and connected topics from a veteran of the field

- https://www.youtube.com/@Borgedesigns Designing 3d-printed tools

- https://www.youtube.com/@Nighthawkinlight Like Applied Science, but trying to do stuff with easily acquirable materials

- https://www.youtube.com/@AdvancedTinkering Chemistry and vacuum tech

- https://www.youtube.com/@ExcessiveOverkill Hardware projects, one of the biggest is controlling an industrial robot arm, but others are cool too

- https://www.youtube.com/@SamZeloof Reached home-made semiconductors

- https://www.youtube.com/@projectsinflight Trying to reach home-made semiconductors

- https://www.youtube.com/@christopherhelmke Building industrial 3d-printed parts sorting system

- https://www.youtube.com/@MariusHornberger Most thorough woodworker

- https://www.youtube.com/@BreakingTaps Like Applied Science, but with more free time

- https://www.youtube.com/@benmakeseverything Cool hardware projects

- https://www.youtube.com/@ancientjames Holograms

- https://www.youtube.com/@NileRed More entertaining than educational, but a prominent chemistry channel

- https://www.youtube.com/@BenEater Classic: made computer on a breadboard

- https://www.youtube.com/@theCodyReeder Like Applied Science, but more outdoors type; builds a Martian-like base

- https://www.youtube.com/@colinfurze A welding guy with extremely high energy, builds underground garage

- https://www.youtube.com/tomstantonengineering Hardware projects mostly about flying stuff

- https://www.youtube.com/@mymechanics Machining guy restoring things; currently restores a car by individually handling every nut and bolt (yes)

- https://www.youtube.com/@HyperspacePirate Hardware / Chemistry projects, made liquid nitrogen with disassembled AC units in a long-running series of attempts