Andreas, an IT guy in Austria who didn’t want his last name used for this article, started out as a hobbyist. He customizes Lego ”minifigs” — the plastic characters that come with a Lego toy set — to create historically accurate dioramas, or three-dimensional models.
Lego had stopped making a specific hat that made his Napoleonic figures accurate. With no experience in product design and no access to a factory, he designed a new hat and had it 3-D printed.