What was the biggest drawback of Chinese block printing?

The Chinese had been carving wood blocks to print books as early as 868, but their process had one major drawback; a new set of woodcuts had to be made for each book. Producing one book was difficult so printing lots of different books was unlikely.

Explanation:

Though he sympathized with the Axis powers, Franco largely stayed out of World War II (1939-45) but did send nearly 50,000 volunteers to fight alongside the Germans on the Soviet front