Customized 3D-printing can provide users with customized products, but need to be verified for quality and durability. In an embodiment, a method for three-dimensional (3D)-printing a customized product includes loading a 3D-font from a database. The 3D font includes multiple character relations. Each character relation connects any two given characters of the 3D font. The method also includes generating a 3D-representation of a customized article product based on the 3D-font. The customized product is based on a plurality of characters received from a user. A 3D-font as described herein can provide customized, on-demand, 3D-printed products of a particular threshold of quality and durability.