... I used an Autoroll pad printer to make collectible baseballs and bats.... I had training at their Boston facility (well close to Boston.... I was coming from the left-coast). These can print on your hard-hats, balls, knobs, fingers, fruit... pretty much any contoured or flat surface. (there is a learning curve for making the pads - to get them to conform there are lots of tricks like varying rigidity of the silicone, leaving strategic voids in the middle of the pad, etc.... really fun way to "put ink on paper"!!