A technician is 3-D printing high-strength, carbon fiber-based filament parts for a customer order.

Comprehensive and Detailed Explanation From Exact Extract:

Carbon fiber filamentcan producefine particles or fumesduring printing, which may be harmful when inhaled. Wearing anair filter maskis essential to protect the respiratory system.

FromQuentin Docter – CompTIA A+ Complete Study Guide:

“When working with advanced materials like carbon fiber, always use appropriate personal protective equipment such as air filter masks to prevent inhalation of dangerous particles.”