I finally got around to trying some rainbow filament. These two prints came out of the same roll of Stronghero3D Rainbox Multicolor PLA. As you can see, there is a lot of variation. I think that you have to print pieces with a lot of plastic for the maximum effect, and some transitions are just going to be better than others. That said, it’s pretty fun to see what comes out. I’m looking forward to some more experimentation with the rest of the roll.