In this video, I’ll show the complete assembly process for my 3D-printed HK MP5, based on the version seen in Squid Game. Step by step, we’ll go through every stage — from preparing the parts and painting the fire selector, to installing springs and final assembly. All parts are designed for easy printing and reliable assembly, with built-in tolerances that minimize post-processing. The build requires three springs, which can be ordered on AliExpress or taken from common household items — such as notebook bindings and ballpoint pens. ➡️ Download the 3D model: 💡 More 3D models and props: 🎨 Our full collection on Cults3D: