As someone who runs a 3D printing business, the quality and durability of my finished products are everything. I'm constantly needing to create strong, reusable connection points in my prints, and these M3 heat-set threaded inserts have become an absolutely indispensable part of my toolkit.The build quality of these little brass inserts is immediately noticeable. They are impeccably machined, with clean threads and a consistent, deep knurling pattern. They feel solid and precise, not like cheap, stamped metal. This precision is critical because it ensures a perfect fit and finish every single time, which is vital for the professional-grade products I deliver to my clients.In terms of functionality, they are flawless. The brass material conducts heat beautifully, which is key to their ease of installation. Using a standard soldering iron set to the recommended temperature, they sink smoothly into the pre-sized holes in my prints. You can see the plastic momentarily melt and flow around the knurls, and once it cools a few seconds later, the insert is locked in place permanently. The pull-out strength is phenomenal. Once set, they are absolutely rock-solid, and I have zero concerns about them stripping or pulling out, even under stress. This gives both me and my customers incredible confidence in the final product's durability.Finally, let's talk about the value for money. For a business, reliability is paramount. This kit comes neatly organized, which saves me time from fumbling around for the right part. More importantly, the consistency and strength they provide prevent failed parts and potential customer complaints down the line. Every insert works perfectly, meaning less waste and more dependable results. For the level of professionalism and structural integrity they add to my 3D prints, the value is exceptional. I simply wouldn't run my business without them.