Ideas

There are several websites with thousands of different 3D prints to choose from. Some files overlap between websites, but normally each website (typically affiliated with a certain 3D Printer brand) will have files made by other people in the community. Check them all out to get some inspiration.

Makerworld: www.makerworld.com, affiliated with BambuLab Printers, Personal Favorite

Thingiverse: www.thingiverse.com 

Printables: www.printables.com, affiliated with Prusa Printers

Other websites exist for select niches, feel free to ask if you also are looking for a specific item and aren't sure where to look.