3 Dimensional projects can be created using an on line program called Tinkercad.
Tinkercad can be used to create a file, which is then saved as an STL file which is loaded into a 3D printer. The web site has a number of projects
to try in order to learn the process of creating in 3 dimensions, and it takes a while to perfect. What looks good from a front view will be totally
off when looked at from above. In order to print a successful project, the object you create must be built on a flat base that is above the workspace plane.
Practicing at this site is the best way to learn how to create objects.
My 3D snowman:
