We've been 3D printing in metal, gold, and even sugar for years now—so it seems only natural that we'd also be able to print in glow-in-the-dark plastic. This week, MakerBot announced a limited-edition run of PLA filament that glows in the dark, just in time for Halloween.

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The filament is made with phosphorus dye, which means it's pretty much the same familiar material that's used to make sticky stars and glowsticks. Leaving it in the light for a few minutes charges up the phosphors in the material, which radiate visible light—eg, they "glow."

The really scary thing, unsurprisingly, is how much it costs: $130 per kilogram, as opposed to $48 for a normal color. [MakerBot]