The leakage of plating solution through the toner may be another problem. Some laser printers tend to print a bunch of closely spaced dots instead of a solid. I have had problems with this in the past on PCBs causing tiny breaks in the circuit. Look at the toner with high magnification, perhaps with back lighting to see if this is the problem. Sometimes this can be improved by adjusting the printer for darker images, since often the default is an economy mode that conserves toner. Another possibility is that the metal being plated might have not been clean enough. On PCB's I usually clean them with an SOS pad followed by Scothbrite and dish detergent. When really clean water should run off in a sheet rather than forming beads. Just a thought, it also could be what you said.
Bob
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