Using a cube as an example, printing the cube on a corner has the advantage of putting the layer lines in a different orientation as well as minimizing the contact area on the print bed.

It might help to think of the whole cube in sections or layers. You could look at the cross shapes and work out how many cubes have been removed. This challenge was all about visualising 3D shapes ...

Using a cube as an example, printing the cube on a corner has the advantage of putting the layer lines in a different orientation as well as minimizing the contact area on the print bed.