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New coloring technique creates perfect spots on 3D-printed cat

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Hydrographic printing looks like a magic trick. You print a pattern on a see-through film, place that sheet on a tub of water and spray it with a chemical potion. When you immerse a bland 3D object in the tub, it bonds with the film and comes back out covered in chosen colors. This technique is hugely popular for transferring patterns on simple surfaces. But, the system lacks precision. Complex textures that are now common with 3D printers, stretch the film, and sometimes even tear it. The final pattern is often distorted. According to Wired, a group of researchers from Zheijiang University and Columbia University have devised a quirky dip-kit that adds computational capabilities to conventional hydrographics.

The team created a new apparatus with off-the-shelf hardware: a couple of aluminum rods and tripods. The twist in their technique is a 3D vision system, a Microsoft Kinect, that maps the location of the object before immersion. It gives them the ability to virtually simulate the distortion so they can use that calculation to print a precise image. In their demo video, when one of the rods slowly and consistently dips the object into the tub, the film in the water wraps around it and aligns perfectly. This method accounts for complex textures so you can immerse the object multiples times at different angles for life-like replicas.

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