I ordered these to use with 3D printed parts to add threads. They can be easily installed by melting them into the 3D print using a soldering iron. All the sizes I tried worked perfectly and sunk right into the plastic. They hold pretty tight too. This kit comes with a good variety of thread sizes for 3D printed parts. M2-M6 screws are commonly used in 3D printed objects so this is the perfect kit. The kit also arrived organized without any inserts in the wrong slot. That is a common problem with screw kits where everything gets mixed during shipping. Luckily this kit was well packaged and did not have that problem. The kit also came with a set of cheap tweezers to pick up the smaller inserts and to help install them. I thought that was a nice touch. 5 stars for functionality and organization. I highly recommend these for 3D printing. All you need is a soldering iron.

Ever want upgrade your 3D printed devices to the next level? These can help immensely. Place you smooth end of the nut into your 3D printed screw hole. Set your soldering iron to 600 degF (315 degC) and gently push the nut into the plastic, making sure to keep your iron vertical. It will set within seconds.

Good variety of inserts.

I have used these for several months now, and have had great success with them in my 3D prints. Highly recommend.

I recently incorporated threaded inserts into my 3D printing workflow, and I'm impressed with the results. Previously, I struggled with the fragility of directly tapping threads into 3D printed parts, often leading to stripping or cracking.

These heat-set inserts have completely transformed how I approach assembly. They provide reliable threads that can withstand repeated assembly and removal. The installation process is relatively straightforward, although some practice is required to achieve consistent results.

Key Benefits:

Increased Strength: Inserts significantly enhance the strength and durability of threaded connections in 3D printed parts.
Reduced Risk of Damage: Eliminates the risk of stripping or cracking threads in the fragile 3D printed material.
Versatility: Suitable for a wide range of 3D printing materials, including PLA, ABS, and even more demanding materials like nylon.
Improved Aesthetics: Inserts provide a cleaner and more professional finish compared to directly tapped threads.
Recommendations:

Proper Selection: Choose the correct insert size and material for your specific application.
Consistent Heating: Ensure even and controlled heating during installation to prevent damage to the part.
Practice: Practice the installation process on scrap parts to develop the necessary technique.
Overall:

I highly recommend the use of threaded inserts for anyone serious about 3D printing. They offer a significant improvement in both the strength and reliability of threaded connections, making your projects more durable and professional.

You will need the right tool to use them, but they are cheap and readily available.