Could do a really low volume flow of nitrogen or argon at the extruder like in welding. You'd still want some ventilation but you'd just need a tank, regulator

Could do a really low volume flow of nitrogen or argon at the extruder like in welding. You'd still want some ventilation but you'd just need a tank, regulator, and tubing instead of a sealed enclosure and you'd probably use less gas. Just enough to prevent anything at the tip from burning.