Version 2.2.0 is available upstream. Please consider updating!
It seems that version 2.2.0 is available upstream, while the latest version in the Gentoo tree is 2.1.1. You think this warning is false? Read more about it here.
Implementation of the 3MF manufacturing file standard from the 3MF
It provides reading and writing capabilities for 3MF files, as well
as conversion and validation tools for input and output data.