Where do I go for deeper knowledge about 3D printing functional parts?
I want to up my game a bit and design some more functional parts. In particular, I want to do more with boxes, organizers, and moving systems.
For instance, I've found some YouTube videos showing hinge design, but I want more. I want more details on WHY they chose the pin to be 1.5 mm diameter, etc. I want design options (can the hinge be somewhere other than halfway between top and bottom).
I'd also like to know how to do enclosures that snap together (same problem: YouTube shows me one or two designs, not much detail on why they are designed that way or how to change them if they snap off).
I want box tops that can stay on. How do I make clasps? Sliding lids? Hinges with stops? Snaps?
I haven't even started to mention my desires to learn about levers/gears/etc.
Can anyone recommend a good book? Or a course? Or a really good YouTuber?