Thingiverse

Thingiverse is a platform for sharing printable design files, where users upload models, browse designs made by others and download files to print on their own printers at home or in a workshop. It is oriented toward makers, hobbyists and designers working with three-dimensional printing, offering a repository organized by category, tags and creator, with remixing of existing designs common among contributors.

Its ads.txt file lists 128 ad systems used for programmatic advertising on the site. Raptive is named as a sales house involved in placing ad spots across the platform's pages.