As far as I know, only college (Dutch: HBO)/university level schools have 3D printers.
Kids I speak to do know about 3D printers. They understand how they work and soon after, they will be giving you printing assignments.
Some US secondary schools are starting with Tinkercad and 3D printing for 10-14 year olds, they have a need for educational material.

This is a good article on the topic: https://www.makershop3d.com/content/...nter-education