I tested it before the year-end and found that it was okay. The QSL card design is good, and I can fit it on a single A4 sheet. Then, I found a printing shop on Taobao that prints on colored copperplate paper, and then I cut it out myself while also rounding off the corners.
In terms of price, it's approximately 4 cents per card (four A4-sized 300g copper foil cards that I printed).
In terms of quality, the colors are not as good as in photographs, but compared to handmade items, they are simpler and cheaper.
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