It could be a fun project for the kids. A bit of googling should get you more information on different brands printers too. Plus all the open source projects available to do mods and accessories that can require some basic to moderate programming skills to be learned.

I know how hard it can be to kids to have enough fun to learn about how to use technology. I spent a few years teaching CAD and 3D printing to kids in school. I also tried to get the machine shop up and running again. But the school would not allow it.