Use Tinkercad to create 3D models that can made with a 3D printer. Remember anything you build is in 3D so you can rotate all around your object and edit all of the sides. Use your google account to log in and use the link below to do some starter projects.
https://www.tinkercad.com/learn/project-gallery;collectionId=OPC41AJJKIKDWDV
Mr. A's Technology Page 