Product Review: AMT PostPro SFX Vapour Smoothing Machine
Our review of the AMT PostPro SFX Vapour Smoothing Machine shows how this system delivers consistent, injection-moulded finishes on 3D…
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Source: Formlabs
Threaded inserts are metal components designed to provide strong, reusable threads in plastic parts. In 3D printing, they’re essential for improving durability and load-bearing capacity when attaching parts with screws. Unlike directly tapping threads into printed plastic, inserts resist stripping and allow for repeated assembly and disassembly.
Heat-set inserts are typically installed using a soldering iron with a flat tip. Gently press the insert into a pre-modeled hole while heating it, allowing it to sink into the plastic. For press-fit inserts, force is applied (often with a vise) to fit them into the part. Precision is key to ensure alignment and secure fit.
Brass is the most common material due to its excellent thermal conductivity and corrosion resistance. Stainless steel inserts are used when higher strength or chemical resistance is required. The choice depends on your part’s mechanical needs and the environment it will operate in.
Heat-set inserts are generally more reliable for thermoplastics, as they melt into the surrounding material for a solid hold. Press-fit inserts are faster to install but may loosen over time if not perfectly sized. Heat-set is ideal for high-stress or high-use parts.
Design your models with precise insert cavities—slightly undersized holes for heat-set and exact fits for press-fit types. Use vertical walls around the insert location to avoid cracking. Consider the direction of load and screw tension to prevent part failure during use.
Avoid forcing inserts into cold plastic—it can crack or warp the part. Don’t overheat the insert either, as it can deform the model. Always test insert fit on a sample print before committing to final parts. Misalignment is another common issue that can be resolved by careful installation.
Threaded inserts are available from major suppliers like McMaster-Carr, RS Components, Amazon, and specialist 3D printing stores. Look for inserts specifically labeled for thermoplastics or 3D printing to ensure compatibility and ease of installation.
From DIY enclosures to custom robotics, threaded inserts are used in a wide range of 3D printed assemblies. Makers use them to secure PCBs in printed housings, while engineers rely on them for strong joints in mechanical prototypes. They are a go-to solution for turning plastic parts into functional, reliable products.
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