Just like the other examples, what's wrong with creating things for yourself to make your life easier?
I know many engineers that use their CAD skills to design 3d-printed objects. Not once had they thought of monitizing their creations; they simply use it to make their own lives easier and improve QoL.
That's why I say I see value in school 3D printing.
But not in a school machining shop since that's a very niche skill. You don't need to machine widgets for your home that much, it is a marketable skill with poor market.
Just like the other examples, what's wrong with creating things for yourself to make your life easier?
I know many engineers that use their CAD skills to design 3d-printed objects. Not once had they thought of monitizing their creations; they simply use it to make their own lives easier and improve QoL.