A few short years ago, a 3D printer seemed like a novelty. But today, the best 3D printers are accessible, print in multiple colors and can build anything from a toy figurine to a self-watering ...

[David] intended to 3D print a spectrogram of a gravity wave, and wanted the graph to go from blue to yellow. Only having a single-color printer, he needed color shift filament, but couldn’t ...