Thought this would be an interesting question to ask the community. Who knows, maybe some filament manufacturers are listening.

What physical properties do you want in filament?

Here are a few I'd like to see:
- conductive filament (using a dual extruder could allow us to print complete electronics parts)
- color changing filament (not sure why this isn't out yet) - a filament that changes colors based on temperature
- camo filament - filament that changes colors based on its surrounding (I know, this seems impossible, but I think one day we will see it)
- more filament like Bronzefill (from colorfabb) where it has enough metal in it that it feels and looks like metal.
- sandy-like filament - a rough and touch surface where you could almost use it as sandpaper.

Let's hear yours