> You can't make a commercial competitor of this printer using their design
Which means it's not open source. Open source means you have the right to distribute work however you want, including commercially, provided you also provide the source under the same license terms as the original.
The second you slap a non-commercial limitation on there, it ceases to be open source.
It's open source : you have the right to study, copy, share and modify
Of course it's not open source, there's no source to even be open or closed yet! It is Creative Commons, though, which is different.
I didn't plan to go into the printer manufacturing business, and there's nothing more open, AFAIK. HP won't let you fix it when they brick your printer for not using their more expensive than blood ink.