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It is necessary to have a file with a negative picture of a printed circuit card. Print it out on a good quality cover of a magazine (dense paper) on laser printer. (There is an opinion that it's better to print on a fax paper, but it not so, it buckles). Then prepare the necessary piece of foil-clad laminate (clean it with emery paper and degrease). Put the printed picture on foil-clad laminate and iron it thoroughly by a hot iron. After the foil-clad laminate will cool down together with the paper, (do not separate the paper on dry) put it (together with the adhered paper) into warm water for 3-4 hours. Then accurate clean off the soaked out paper by fingers (polymer printing remains on the foil-clad laminate). Now you will need only to clean tracks with a needle and etch the card.