Final answer:
Johannes Gutenberg had to overcome four main problems when inventing the movable type printing press: creating individual metal type blocks, developing a mold, designing a press, and finding the best ink and ink distribution system.
Step-by-step explanation:
Johannes Gutenberg had to overcome several problems when inventing the movable type printing press. The four main problems were:
- Creating individual metal-type blocks for each letter to ensure consistency in size and shape.
- Developing a mold to cast the metal-type blocks efficiently.
- Designing a press that could apply even pressure to the inked type blocks and paper for a clear print.
- Figuring out the best type of ink and ink distribution system.
By resolving these challenges, Gutenberg was able to revolutionize the printing industry and pave the way for the mass production of books.