What do you do with the models you download on GrabCAD?

Since I've started uploading models to GrabCAD, I've been wondering, what do people generally do with the models they download from here?
What do you do with the models you download? Do you 3D print them? Do you use them as a learning tool by seeing how they are made? Do you use them for rendering or animation?

I'm really curious to know this. I think a better understanding of what models are being used for will help me to make better, more useful models. If you have a minute, please let me know! (:

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