Does anyone have any experience printing on metal or other hard surface with the Z3100. If it can be done, it would need to be fed straight through into the printer. The sheet paper feeder can be removed and it appears that something could be fed directly into the printer by hand but do not know if this would be the way to do it or even if the printer can handle it.
For several reasons the Z3100 isn't the printer to experiment with for prints on rigid sheets. The media transport is limited to 0.8 mm and has a slightly inwards curved path + the transport wheel clamping is a strong one. Even if you can find a suitable printable material of that thickness you may see damage to the coating as that always will be the softest side of that media and it is touched by small rolls.
I'm not afraid to experiment. On my older Epson wide formats I have pulled through 1.3 mm polycarbonate with an inkjet coating that I had applied with silkscreen printing and on other occasions museum carton of 1.8 mm (0.3 mm more than recommended by Epson). The media transport paths of the Epsons are different though. It would not be in your interest or HP's to go to the limits of the Z3100 as I foresee damage to the moving parts and there's more in that head assembly than just the heads.
try: [a href=\"http://groups.yahoo.com/group/Wide_Inkjet_Printers/]http://groups.yahoo.com/group/Wide_Inkjet_Printers/[/url]