The Blade catch on my knife broke so I designed one to replace it. The one in the image was an older version that had the same ridges that the original one had. the ridges printed terribly so I decided to cut them from the finished model.

I printed mine out of Bambu Lab PAHT-CF because I was also printing more structural parts at the time but I'm sure basically any other filament would work.

Tolerances are built into the part as my printer was making the Y dimension a bit large so it should fit without any post processing, though you milage may vary.