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[ckirmser]

I'm still new to the field, so I may be mentioning something that already exists, but a material that can be set to deliver PANTONE-quality and compatible colors to a common foundation. Also, and I see this has been mentioned, a conductive material.

[jintaco]

First thing that came to mind was conductive materials.

Going on a slight tangent, but it would be cool to see filament/software combinations to create gradients on a print - whether the color shift comes from one spool that has multiple colors chained or a multi-spool support.

[dngrhm]

conductive

non-solid color - variegated/camo (could make prints look better without having to paint), metal flecks/GLITTER (would be awesome but may clog), edible filament (a bit of a stretch but fun)

[colemccully]

It would be nice if someone came out with a filament that has more strength then your average pla or abs filament. steel reinforced or something.

[GoTime]

Can you guys make some filament that changes color when the temperature changes (think mood ring filament?)

[Jeepguy42]

This is a question posed by 3DFilaPrint
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What new material do you think the filament market isn't providing, or isn't providing well?

Metal type filaments. I know this is a difficult thing as metals don't print well but using a paste extruder and a material similar to Precious Metal Clays that could be fired in a post process fashion to create 3D items in metal would be a great alternative to actually printing in metal using a FDM style printer

[Grish]

graphene - I read that Graphene 3D Lab Inc are working on this. Will be awsome to print custom made power sources.
rubber material - biodegradable material - reusable materials: Probably need some kind of melting machine that makes your filament back into wire - or "just" a melting chamber integrated in the printer that you can toss old printed parts into.

[GameProps]

Perhaps the one type of filament I have heard the most complaints about has been the clear filament. Everything from it jamming up an extruder (worse than other filaments have) to issues with layer sticking. The filament I would like to see most of all would be a alumide filament.

[wcarver1]

The capacity to produce optical elements via FFF, even if it included post-processing.

[natchor8]

I think having flavored, candy type filament could be provided.