mymain issue with a printed mask is simple.
The only part of that mask that is a viral filter is the actual filter pad you insert into the holder.
The actual mask itself is most likely going to be porous enough to let the little bastards through.

Plus it's a great surface for viruses to settle in.
Basically any 3d printed mask will need to be disposed of after a single use.
Difficult things to properly sterilise.

I know people want to help. but unless you have an industrial sls setup or an sla machine - resin prints are watertight and should be virus tight. You really should not be making medical equipment and believing it's keeping any one safe.