Features: Easy assembly 3D Printing Engine Model Kit, featuring all necessary components for easy and enjoyable DIY experience. . To complete the assembly for entirely functional, users also need to download the model files and 3D print the remaining parts. This durability set ensures long time use model, perfectly for extend display or play. For car model enthusiasts, educators, and DIY hobbyists precise and realism in their projects. For most common 3D printers, users can customizing their printing setting to suit their equipment, making it a versatiled addition to any 3D printing collection. Specifications: Item：3D Printing Engine Model Kit Yellow Motor Size Length: about 4.50cm/1.77in In the Box： 1. Motor (DC5V 59RPM) x1pcs 2. BT2.6x8 SHCS Self Tapping Screw x 58(44pcs for assembly, remaining extras can be as spares) 3. M3x23 SHCS Machine Screw x2pcs 4. 4x2mm Round Magnetic x16pcs 5. 0.5x7x12mm Helicaled Compression Spring x4pcs Package Includes: 1Set 3D Printing Engine Model Kit note: 1. Please power the device using a USB power supply with the specified voltages. 2. Please test the operating of the mechanism by rotating the control handle before powering. After powering, verifies the operational status of the motor and be cautious to prevent motor blockage. 3. It is recommended to use indoors at room temperature. 4. The appearance of the engine in the picture needs the customer to print it in 3D, and the suit not include the engine.