The paper factory of Molí Fondo is a great example of the importance the paper industry had in Sant Joan les Fonts. A primitive mill was built in this spot in 1723 and it has been modified over the years. The factory, which took different names, existed until 1967, when it took a place near the monastery under the name of L'Obra Nova. It remained there until its production process stopped. From this place you can observe how the lock diverts the water in order to make the turbine move.