Why can't we have FDM printers print in Metal Filament?

[ImaginationProgress]

The first uses a two stage process. First stage is to print a clay made up almost but not entirely of metal particles. You use a paste extruder, such as this one from thingiverse, loaded with a metallic clay such as this (which evidently sees a lot of use by jewelry makers). Second stage is to fire the piece in a kiln. You end up with a metal piece.

What other materials besides metal would this clay be made up of? What happens to the clay once the piece is fired in a kiln? Would the object change shape/shrink when heated?

[3dkarma]

What other materials besides metal would this clay be made up of? What happens to the clay once the piece is fired in a kiln? Would the object change shape/shrink when heated?

I'm about as familiar with the material as you are, but from the ebay listing: "Shrinkage during firing is about 10% to 18%, and the purity of the fired clay is 99.9% which can be laser hallmarked if required by most UK assay offices." Evidently the clay is made up of a binder, water and fine particles of metal.