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Well ! ! !
3D Printer is at the Top because it has a number in the Name alphabetically speaking, It was a play on words stating its location on the List..
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This is correct, however would never tell Jay Leno that his Hobby of restoring old cars was not.

Word is he just sold all his entire car collection to Arab Sheikh for about 1 billion dollars.
Now...

You are outright wrong.

Definition of hobby

an activity or interest pursued for pleasure or relaxation and not as a main occupation:

https://en.wikipedia.org/wiki/List_of_hobbies
An guess...

I bought my 3D Printer as Both, I have used them to print many 3D Models for fun.
Rubix cubes, containers, Bird feeders, toys, redesigned obi-wan kenobi light saber with sound, ect...

Have 3D...