Not open source:
"Open Printer will use the Creative Commons BY-NC-SA 4.0 license for all of its files, including electronics and mechanical design files, firmware code, and the bill of materials"
So it will be illegal to manufacture it for a friend, manufacture replacement parts and sell them etc. ...
Openwashing should really be fought
"Open Printer is an open-source, repairable inkjet printer designed for makers, artists, and anyone tired of throwaway hardware. Built with standard mechanical components and modular parts, it’s easy to assemble, modify, and repair. You can print on standard sheets or paper rolls and choose between black or color cartridges, refillable at your convenience."
https://www.crowdsupply.com/open-tools/open-printer