This is a 20x20mm aluminum profile, commonly used as a system, mounting, or construction profile with a 6mm slot (Type-I). It resembles the typical X-axis rail found in conventional 3D printers. As only an STL file is usually provided, I've included STEP, IGES, and STL formats for convenience. The standard length is 50mm, but it can be customized to fit specific requirements. Feel free to request additional formats if needed.

Happy designing!