There are two main (and one minor) reasons to use a pop screen.
1. to reduce explosives which bottom out the capsule diaphragm
2. to reduce or eliminate spit contamination of the diaphragm
3. to keep a singer at a specific minimum distance from the microphone
Item number two is not served well by any of the metal pop screens on the market (and I think I know of what I speak, because I always inquire if, and what type of pop screen was used when I do capsule restoration/spit de-contamination work for clients): Aside of the fact that almost all metal screens have acoustic resonance, the mesh or hole density in these screens is too coarse to capture spit mist effectively.
That is why nylon threads of pantyhose material are so effective in filtering airborne contaminants, yet passing audio at a still acceptable level of transparency: the opening between layers of material can be made much smaller because the material is so thin.
Bottom line: whether home-made or commercially acquired, a dual-layer of nylon hose material is still the best popper stopper compromise between complete filtering and transparency