As suggested, here's an area dedicated to multiple filament 3D printing - both multi-color materials and multiple material types!
Multi-color printing is very popular as Bambu Lab machines have really brought the cost of entry down in price!
Also, there are various IDEX machines that use multiple print heads as well.
Asides just the ability to change colors in a print, there is also the means to use a second material for a support material.
Enjoy the new section of the forum!