You should see how some low budget Chinese factories that pump out laser-cut cards (etc) operate.
I've seen videos of workers huddled in a small room operating wholly unshielded galvonometer-type lasers (as in the sort that were popular in laser shows in the 80s.. but with lasers designed to actually cut) without any extraction, using bits of corrugated card to manually waft away fumes.
I've seen videos of workers huddled in a small room operating wholly unshielded galvonometer-type lasers (as in the sort that were popular in laser shows in the 80s.. but with lasers designed to actually cut) without any extraction, using bits of corrugated card to manually waft away fumes.