@Logan-f

You may explore the following platforms to discover 3D models:

Thingiverse Cults Free3D

Once you identify a model of interest, download the corresponding file to your computer. These files are typically provided in a compressed ZIP format. After unzipping, you will find the STL file, which is the standard format used for 3D printing.

Alternatively, you can upload the STL file directly to the Poloprint Cloud app on your mobile device via this link.