These carabiners are modeled after threaded links that you can find in any hardware store. I made these big enough to be used as carabiners. They are approximately 85mm X 12mm X 50mm. The internal design of these makes them extremely strong (tube within a tube) construction. Print in provided .stl orientation with a raft and external support. Once you have the carabiners printed, remove the support material from both halves the carabiner. Next use a high strength (30 minute setting epoxy) to glue one side of the pin in place - then screw on the hexagon nut on to the longer carabiner half. Now epoxy the other side of the pin and join the two halves of the carabiner together. Make sure your threaded end is lined up with the nut. Push the epoxied haves together and let them dry for at least an hour. Note: It is best not to screw the carabiner ends together during the gluing process (this may cock and widen your glued split in the carabiner halves). I was even able to acetone vapor treat this model after it was assembled. If you want to know how I accomplished this, just let me know and I will describe the process to you. Happy Printing Makers!