3D printers build parts one layer at a time. The resulting part rises up from the build platform in the "Z" dimension as it is made. Rize replaces the "s" with a "Z" to play on that 3rd dimension(Z) aspect of the process.
If you use fonts that require a license, confirm with the client they're ok with it. For licensing reasons, it is better to provide your client with information on how to acquire the font rather than providing the actual files.