Fantastic kit-card combination padlock by LoboCNC.
My modifications are 100% implemented in Bambu Studio:
I selected the same license as the original creator did on that other model sharing platform; all credit to LoboCNC here, my changes are very small. I've included the original assembly guide here, unmodified. Note that some sanding of the center pin will likely be required (you install this pin in the first step of assembly), else it is just too darn snug fitting.