3D printing is a popular process, though one of the hangups is that parts are typically produced in just one flat color. Aad] has been working on a simple modification to his Prusa i3 printer that enables the production of full-color parts. The hack is simple, consisting of a second vertical frame added on to the printer. Rather than mounting a second extruder there’s a inkjet printer head delivering CMYK water-based inks. After the main extruder lays down each layer of clear PLA plastic, the print is then moved under the inkjet head, which lays down colored inks before the next layer is printed, as seen in this print video. The ink seems to bleed between layers, mixing with the plastic after it is laid down. We’ve seen other approaches to the color 3D printing issue before, too.

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