Why it's so special: This image of a spiral galaxy taken by the Hubble Space Telescope is a portrait more than two decades in the making. Like most full-color images of space objects, it's a ...

There is such a thing as bi-color filament (like MatterHackers Quantum ... Here is how it works: the 3D model for filament is a spiral that is the right diameter for filament, printed as a solid ...