Digital printing in the United States will be very active in the next few years
according to the statistics of American printing industry, the development of the American printing industry has fallen into a trough since the impact of the 2008 financial crisis. In 2007, the output value of the overall printing market in the United States was 174.483 billion US dollars, while in 2009, it fell sharply to 140.675 billion Figure: I) filling structure inside various 3D printing tubes
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