M3/#4-40 Heat-Set Inserts for Soldering Irons by Virtjoule

Strengthen your 3D-printed project's connections and maintain clean surfaces by using robust, reusable machine screws and heat-set inserts. These inserts, costing just a few cents each, feature grooved exteriors and internal threads, originally designed for injection-molded parts but effective for 3D-printed plastic as well. Traditional soldering iron tips may catch on the insert's rim, causing frustration and part damage. Virtjoule's insert tips, with their vertical walls, allow the iron to pull out cleanly after pressing the hot insert, ensuring the insert is square in the piece.

• Compatibility: #4-40 or M3 inserts
• Soldering iron sold separately
• Installation Note: Heatset tip may feel slightly loose initially
• No Worries! It functions perfectly and all tips are uniform