What the M3X3 threaded heat set insert does

The M3X3 OD 4.5mm Threaded Heat Set Insert is a brass knurled insert designed to create a strong, repeatable thread in 3D printed or wooden parts. The insert gives you a reliable anchor point for screws when assembling parts together.

Rather than fastening directly into the base material, these threaded inserts provide a more durable connection for parts that need secure, repeatable assembly.

Key features of the brass knurled insert

• Brass construction supports durable threaded fastening in printed and wooden components.
• Knurled exterior helps the insert grip inside the part for a more secure hold.
• M3 internal thread provides a standard anchor point for M3 screws.
• Repeatable threading helps maintain a consistent fastening point for assembly and reassembly.
• Pack of 3 inserts suits small builds, repairs, or multi-part assemblies.

How threaded inserts improve part assembly

These heat set inserts are useful when a printed or wooden part needs a stronger fastening point than the base material can provide on its own. The added thread helps reduce wear in repeated screw installations and removals.

For makers building enclosures, fixtures, brackets, or custom assemblies, the insert creates a dependable screw anchor that helps keep joined parts secure.

Use cases for 3D printed and wooden parts

• 3D printed assemblies: Add durable M3 threads to printed parts that need to be opened, adjusted, or reattached.
• Wooden components: Create a stronger threaded connection point in small wooden parts or custom projects.
• Prototype builds: Improve part fastening in functional prototypes where repeatable screw use matters.
• Repair and replacement work: Restore or reinforce fastening points in compatible custom parts.