Pad Printing

Pad printing is essentially the process of printing a 2D image on to a 3 dimensional object rather than a flat one. This done by transferring the image to be printed on to a silicone pad and then on to the object.



This is one example of how the pad printing process can be used to print on a 3D object.
There are a lot of other examples such as these:

Pretty much anything 3D can be pad printed but usually it will only be because there is no other realistic way to print it.