Despite the clickbait headline this isn’t open source

Open Printer will use the Creative Commons BY-NC-SA 4.0 license

The NC license isn’t open source, it violates point six of the OSD

They will use CC BY-NC-SA 4.0. Which means it’s not open source, and no-one else can sell replacement cartridges, parts etc.

It might still be a good printer and enjoyed by some, but it really annoys me when companies mix these terms up, almost certainly deliberately.