Threaded Brass Insert for 3D Printing JustPi — kit 50 pieces, various sizes

JustPi threaded brass inserts for 3D printing are a kit of 50 metal inserts in various sizes designed to create durable internal threads in thermoplastic parts. These brass inserts are intended for installation by heat pressing or ultrasonic insertion into printed components, producing reliable M-type threads for mechanical assemblies, enclosures, fixtures and repair tasks. The kit provides a range of insert sizes to match different screw diameters and wall thicknesses commonly encountered in hobbyist and prototyping work.

Advantages

The brass construction offers good corrosion resistance, reliable dimensional stability and improved wear resistance compared with direct tapping of plastic. Inserts distribute fastening loads over a larger area of the printed part, reducing stress concentration and preventing thread stripping in softer thermoplastics. A mixed-size kit ensures flexibility across multiple projects and reduces the need to source individual sizes.

Suitable for

• Prototyping and hobby 3D-printed enclosures and parts
• Repair and retrofit of plastic components requiring strong threaded connections
• Fixtures, jigs and small mechanical assemblies made from thermoplastics
• Electronics housings requiring repeatable screw mounting points

Key specifications

• Material: brass
• Quantity: 50 pieces per kit
• Installation methods: heat press insertion, ultrasonic insertion
• Compatibility: designed for use with common thermoplastics used in FDM/FFF printing
• Function: internal M-type threaded connections for fasteners

How to use

Choose an insert size appropriate for the screw type and the thickness of the printed wall. Prepare the printed part by cleaning the insertion hole and ensuring correct diameter and depth for the chosen insert. For heat pressing, apply controlled heat to the insert using a soldering iron with an insert-tip or a dedicated heat-set tool, and press the insert straight into the hole until the flange sits flush or to the recommended depth. Allow the part to cool before applying torque. For ultrasonic insertion, follow the ultrasonic device manufacturer's instructions and use a compatible sonotrode to embed the insert into the thermoplastic. Avoid overheating the surrounding material to prevent deformation.

Usage recommendations

Use inserts in appropriately sized holes and verify thread engagement with sample pieces before final assembly. When working with thin walls, consider reinforcing the area with higher infill or a washer on the mating fastener to distribute load. Store the kit in a dry place to preserve material condition and choose installation parameters that match the specific plastic type (PLA, ABS, PETG, etc.).