I have several of these snips and they work great… except the lock wears out overtime and they keep popping open. A quick run at a replacement part and here it is. I made it a bit snug and it works well. One end is flat so that it can print without supports and it also gives a better connection at the base of the scissors. Just install it with the flat end going up to the blades.

3MF File: This has modifiers on the STL so that it prints with fuzzy skin to give a bit more texture and also uses variable layer height to smooth out the curved end better.