I have a bunch of Stanley 5192 blades, which don't fit any of my utility blade holders.

So here's The Claw. It uses two screws to hold the blade, so there's no chance the blade will move or rotate.

Hardware: 

• Stanley 5192 blade(s). I mean, why are you here in the first place 😉

• 2 M2.5x6 screws

• 2 M2.5x3x3 heat-inserts or 2 M2.5 nuts (I didn't check the possibility of using nuts since I don't have any)

• 2 M3x12 screws

• 2 M3 nuts

Printing:

It's a simple print in general. However, the cap will require your printer to print bridges well. Otherwise, I assume it won't fit.