There are many websites to download 3D models. The best part is the majority of them are free. The one I recommend the most is thingiverse.com. It has a large selection of items available. When you download a model and un-zip it, you will see an .stl file for each object. This is the most common extension for a file containing a 3D model.
You can view the .stl model on the thingiverse site or through various free programs like Paint 3D or 3D Viewer.
You can find us here: thingiverse.com/makeprintfix
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