The goal of Ofast3D is to increase the production capacity of fused deposition modeling 3D printing, without requiring any modification of existing production infrastructures. Ofast3D aims to reduce printing time without impacting the print quality by optimizing the code interpreted by 3D printers during its generation by taking into account the geometry of 3D models. Ofast3D is complementary to methods aiming either at improving printers or at optimizing 3D models.