This compact green device is the ST-LINK/V2 debugger—a versatile tool commonly used in embedded development to flash firmware onto microcontrollers like the STM32 and perform in-circuit debugging.

The striking green enclosure you see was custom‑made using 3D design and 3D printing: First, you’d create the enclosure’s CAD model in a 3D modeling software such as SolidWorks or Fusion 360, carefully sizing it to fit the ST-LINK while reserving space for the USB port and debugging header pins. Then, you’d print the enclosure using a 3D printer with green filament, and once printed, simply pop the ST-LINK motherboard into place.

This custom‑made enclosure not only provides robust protection for the debugger’s circuit board but also enhances interface clarity through laser‑etched markings—such as “STLINK-V2” and “TX/RX”—making it an ideal choice for electronics enthusiasts looking to dive into DIY projects.

If you’re in need of the internal PCB, feel free to send me a private message—I’ll gladly share the PCB design files at no cost.