I didn't like any of the allen wrench holders I saw, and I thought, "Why not just combine a traditional holder into a 1x1 gridfinity square?" I tested with both standard and metric sizes and both work great! I've included files for Bambu studio with text showing metric sizes. You can edit the blender or the .stl file and add your own text if you want to for standard or whatever. For printing uhh, I don't know? Print it rough and fast and maybe with a brim? Doesn't need to look too pretty as it's purpose is to hold things!