What kind of metal do you want to print?
Here in the US, Dupont sells a range of metal conductors, primarily for
PV applications, that are various mixes of silver and/or aluminum,
thicknesses from 10-50u.
The high temp silver and Al conductors require 675C or higher to fire.
Dupont also sells epoxy and thermoplastic silver pastes that cure at low
temps, but these typically do not have as low an R value, and are not as
rugged. USeful for substrates which cant withstand high temps such as
plastics.
Ferro is another source.
If your looking for solder pastes, thats a different matter. Trend is
now lead free, typically 5% silver, 95% tin.

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Tom Rust
Nanochip Inc
(510) 339-6263
(510) 339-9636 FAX
(510) 912-4662 cell
http://www.nanochip.com