Naomi Wu’s heat-set insert press (sold via CyberNightMarket.com) is a digitally controlled, all-metal tool with M1.4–M6 tips for melting brass/steel nuts into FDM prints. She recommends 300°C and 10–15s dwell, uses rubber bands for adjustable force, and argues inserts improve layer-strength alignment, enable iteration/assembly of larger parts, and speed small-batch production.