I would like to make custom insoles for my wife.

This company makes a flexible filament that will be soft to stand on:
<http://recreus.com/en/>

I do not currently own a printer.

How can I measure her feet and transfer the measurements to the printer?
(one of these comes to mind: <http://www.eggheadtoys.com/pin-art/>)

How can I measure the inside of the shoe?

What kind of printer can print with the flexible filament?