That was reserved for Gutenberg. As an experienced metalworker, he grasped that printing could best be achieved with movable letters made of, not pottery or wood, but metal.
Tā kā viņam bija pieredze metālapstrādes darbos, viņš saprata, ka vislabāk iespiešanā būtu izmantot atsevišķus burtus nevis no māla vai koka, bet no metāla.