Normally, you have a choice with PCB prototypes: fast or cheap ... FR4 uses epoxy which will probably produce some toxic fumes under the laser. We were surprised at how good the boards looked.

like many of the other PCB printers we’ve seen. Instead of printing out the board artwork to a transparency or mask, [Tixiv] used a 1 Watt 445nm blue laser with a hexagonal mirror to directly ...