Can a 3d printer make this part?

[curious aardvark]

forget a scanner - learn to use digital calipers and openscad: http://www.openscad.org/

the only low budget scanners currently worth their salt are the scan-in-a-box: https://www.scaninabox.com/
and the einscan scanner: https://www.einscan.com/

But you will find that not only is it much quicker to measure and model a part from scratch, it's also a LOT more accurate.
Unless you've got $10,000 to spare - scanners just aren't as good as learning how to design parts from scratch. And it's easier than you think.

[hdtvjeff]

Wow!

Are you saying I can make those pulleys without a scanner if I master the methods you mentioned?

Does a digital caliper take into account slight curves and rounded corners too?

As a newbie we would be talking a long time?