A man named Michael Stabile has launched a Kickstarter project in which he is looking for $65,000 in funding to produce his Multistruder. The Multistruder is a 3D printer extruder which can use 4 different filaments at once. It can even heat all the hot ends at different temperatures so that different materials can also be used as well as different colors. More details on this add-on can be found here.

Here is a picture of some of the cars he printed out with the extruder:


and link to the Kickstarter project

https://www.kickstarter.com/projects...er-for-your-3d