After designing your files in a 3D modeling program, you export them to the slicer, mostly in STL ... free 3D slicers you can ...

3D printing ... of 3D print files in the widely used STL format. It stands out from other websites for 3D print files due to its strong community interaction and its focus on free access to ...

The two work very differently, especially when it comes to editing. 3D printing has a long history of using .stl files (which are meshes) but making engineering-type changes to such files is ...