"Chong'er said that these machines can only be used for one year, can you extend it for a while?" Li Shimin asked at Qin Feng.

"Back to Your Majesty, the service life is only one year because this machine is wooden, and the wood will be deformed after a long time, resulting in errors in the machine, and there is no way to extend this time." Qin Feng said to Li Shimin and the others.

"It seems that it can only be changed every year." Li Shimin wondered.

"Yes, Your Majesty!" Qin Feng replied.

"Wouldn't it be okay to replace it with iron?" Fang Xuanling on the side asked.

"Yes, but it takes about half a month to a month to make such a machine out of iron, and some small parts need to be polished. And grass farmers can't buy large quantities of iron now. Qin Feng replied.

"Can't buy it? Chong'er, what's going on? Li Shimin asked.

"This?" The eldest grandson Chong looked confused, completely unaware of what was going on. Qin Feng didn't tell himself that he could make it with iron.

"Your Majesty, I didn't say that this thing can be made of iron. At that time, I was in Dali Temple, so I could only let Changsun Chong make it with wood first to see the effect. By the time I came out, Changsun Chong had already finished it in large quantities. I didn't change it. Qin Feng hurriedly stood up and said.

"So that's the case, as long as it can be built, I will ask the household department to send a batch of iron to Qinzhuang when I go back, and you will arrange for craftsmen to build it as soon as possible." When Li Shimin heard Qin Feng say this, he understood.

"Your Majesty!" Qin Feng had no choice but to agree. I didn't expect this to fall on my head in the end.

"Come on, everyone, tell me, what do you think of this viewing?" After arranging Qin Feng, Li Shimin said to the ministers.

"I don't understand, the old man just sees that these machines are very clever, but the old man still can't understand how they print." Wei Chigong pointed to the machine and said with a smile.

"I didn't expect you to understand, you can't read books, how can you understand this printing press?" Li Shimin glanced at Wei Chigong.

A group of ministers burst out laughing.

"Wind boy, there is one thing that the old man doesn't understand, that is, those layouts, are they all carved?" Everyone closed their laughter, and the eldest grandson Wuji asked Qin Feng.

"It's carved!" Qin Feng replied. Everyone still doesn't know the key to the art of printing, that is, movable type printing, the printing in their eyes is a full-page engraving, Qin Feng is obviously different from them, but Qin Feng will not be stupid to say this.

"In this case, the cost of printing is very high, so the price of this book is probably more expensive!" Zhang Liang, the secretary of the Ministry of Industry, said.