I've used them several times before. Thinking of asking for one for Christmas. I use TinkerCAD to make a lot of my projects, but I learned AutoCAD as well, but I need to learn SolidWorks and Sculptris if I want to learn how to truly make things :D
Shame--3D printers are most popular with our generation ;)
Also Millennials are generally the most material generation ever. So materialistic that it's one of the cringiest things ever.