Printing a paper $1 bill is cheaper than producing a penny, which, according to the U.S. Mint, is comprised of 97.5% zinc and 2.5% copper and requires a smelting process to mold the metals. According to the Federal Reserve, it costs Treasury's Bureau of Engraving and Printing 3.2 cents to print a $1 note – less than the cost of minting a penny. สล็อต