How to figure out profitable niche things to manufacture?

Question

Do we have playbooks for manufacturing? From finding products to manufacture to setting up a factory?Where should one start looking for things to manufacture?

SongofEarth · Accepted Answer

You really need to be more specific, you want to make something small or large? Electronic or mechanical?
As a general advice, look for the intersection of things you love and use yourself and things people want.
There are interesting youtube channels if you need some inspiration:
Knifemaker, from garage to factory: youtube.com/user/JohnGrimsmo/
Kit planes: youtube.com/c/DarkAeroInc/