Before generating the G-code file on Luban, you should prepare a model file. Here are a few options for preparing the model file:
Use provided models in the Case Library of Luban.
Design 3D models using the 3D modeling software, like SketchUp and Fusion 360.
Download free and high-quality 3D models online, like thingiverse.com and myminifactory.com. Refer to Feed Your 3D Printer: 17 Awesome Websites to Download 3D Models for more detailed information.
3D scan models of various physical objects using a 3D scanner.