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[AlexGk]

Conductive materials to be used with very high resolution printer, like SLA.

[gtprintr]

HDPE would be nice especially if it could be extruded from recycled materials. I really wish I could print ceramic or would too.

[Tdor]

cheaper abs/pla materials; conductive filaments

[CVanSteyn]

The conductive filaments are interesting to me and I would like to use them in the future.

[ajperez]

Biopolymers like polysaccharides (cellulose, starch, agar) or proteins (collagen, gluten, soy, corn).

[ckirmser]

Organics. The ability to print out body parts to replace missing, damaged, diseased or weakened limbs or organs would be fantastic.

[badscr]

Ceramic
Castible material for lost plastic casting

[dngrhm]

multi-color - would make a simple print look finish with out painting. A camo anything would be cooler than a solid color thing.

edible - 3d print a mint

wax - 3d print candle

[Grish]

Graphene and Glass

[talk2sumanta]

Ceramic, again, answered earlier