A humble but well protected banana plug. When you just need one and you run out of your stock.
Make sure you tune your hole tolerances as the metal part
is press fitted and it requires a good amount of force. Ideally use a vise.
The cover part can be printed in a different color (usually black/red) or colored after the print as I did.
Print at 0,12mm layer height with PLA or any other common plastic.
The author hasn't provided the model origin yet.