I think there’s some semantic confusion with that article. That’s not what I see. There are literally kits for sale on the Prusa Site to convert your old prusa into a new Core. imho, What the ‘RepRap Open Source folks’ mean is literally every part is sourced from already available parts or can be printed. And I think this is where the article is going. The other Open Source -is Open Ecosystem. Where there may be proprietary pieces (the steel cage), but nothing about it is purposefully closed. Prusa published the full electronic and hardware schematics before the machine was shipping. prusa3d.com/…/open-source-at-prusa-research_23681… This is also ‘Open’. Both are good. Both have valid rationale. But neither is anything like closed source, closed box, only we can touch it companies models.