This 3D model depicts a historic 12 mm Lefaucheux pinfire cartridge—a pioneering, self‑contained metallic cartridge that saw widespread use in mid‑19th‑century revolvers such as the French Lefaucheux models. The original 12 mm Lefaucheux featured a black‑powder propellant loaded within a single metallic case, complete with an integrated primer and bullet, offering faster loading speeds and superior moisture resistance compared to earlier paper cartridges. The model accurately replicates the authentic historical dimensions of the 12 mm cartridge case and overall length, making it ideal for educational demonstrations, display pieces, or as a reference prop.

To achieve the most accurate visual representation, print the cartridge case as provided, then craft the small side pin by cutting a 10 mm segment from 1.75 mm filament and carefully gluing it into the pin hole after printing. This approach ensures a robust printed model while faithfully capturing the distinctive pinfire design. The model is optimized for straightforward FDM printing, requiring no supports or brim, and is compatible with common materials like PLA, PETG, or ASA.

Download the model, give it a try, and if you find it enjoyable, we’d love for you to share your prints, leave a rating, and help others—history and firearms enthusiasts alike—discover this fascinating piece. If you need specific dimensional adjustments—whether scaling up or down, or customizing the model to fit a particular revolver or display—simply leave a comment, and I’ll be happy to prepare a tailored version. You’re also welcome to suggest other historical ammunition types or related components you’d like to see modeled next.

Recommended print settings:

• Material: PLA / PETG / ASA

• Supports: none

• Brim: none