Use a color wheel to choose complementary colors. (Dreamstime) I don’t know about you, but that was the point when young me started scratching my head, thinking those colors look terrible together.

To be even more precise they’re CMYK in print because they’re secondaries and each (excluding black) reflect 2 primaries so when you mix 2 together you end up reflecting a single primary, but ...

Recycling 3D filament is a great idea in theory, and we come across homemade filament extruders with some regularity, but they do have some major downsides when it comes to colored filaments. If yo… ...