I lost the gas cap on my lawnmower. A LLM designed a replacement cap I can print. It is designed to fit onto a gas tank nozzle with exterior threads and the following dimensions.

• inner diameter (smooth): 1-5/16 inches
• major outer diameter (total, from outside of threads): 1-5/8 inches
• minor outer diameter (from inside of threads): 1-3/8 inches
• length: 5/8 inches
• thread density: 7 threads/inch