Here's a quick guide on creating a rock in Blender. How to export an obj file and import an obj file into Blender 2.8 Thanks ...

Launch Paint 3D and open an OBJ model Save the model in FBX format using a dedicated option. Let us now discuss these steps in detail!

The other formats supported in it are OBJ, GLB, PLY, FBX, and 3MF. To view STL files in Paint 3D, click on the Open button on the welcome screen and then browse and import an STL file to it.