It prints just numbers, because he was obsessed with numbers, but it does print onto paper, and it even does word wrapping, so if you get to the end of the line, it goes around like that.
彼は数字に捕らわれていたので 数字しか印刷できません でも紙に印刷し ワードラップさえします 行末まで行ったら 先頭に戻るんです