Except you didn't solve the problem. Yes, the problem was solved, but not by you.
When I was in high school, the school library had a "Where's Waldo" book. Someone has taken a red marker and marked with big red arrows where Waldo was on every page.
The problem was solved, but I found no pleasure in it.
>Printing something out of Thingiverse still solves the problem, as does buying something ready-made.
That's a good point. If my motorcycle has a broken spark plug, I won't create my own. I'll go to the store and buy a new one. I've solved the problem.
I could also take it to the mechanic and get it replaced there. Much like the Where's Waldo book, the problem has been solved for me.
>As for the writing, there are actual studies that writing by hand activates different parts of your brain than typing.
Doesn't matter, the final product is still your own work.