QIDI Technology Resin 3D Printer:S Box, UV LCD Printer, 8.46" x 5.11" x 7.87" Large Build Volume,10.1 inch LCD, High Precision Double Guide Rail & Precision Ball Screw, Fast Leveling Structure: Amazon.com:
This printer at work uses small coloured balls for ink : r/mildlyinteresting
Golf Ball Printing Machines | How to Print on Golf Balls
Printer Types Ball Printer-Impact type- Uses a round ball with raised characters. Chain Printer- Impact Type- Uses a character slug attached to a chain. - ppt download