Appreciate your patience with the followup.
Corporate sponsorship for design projects seems to be the best project candidates for shared design work and design challenges. Lunchforth/GrabCAD ran various projects with larger companies/organizations that were open (i.e. HP Mars, NASA, GE Innovation, Stratasys, etc.). In most cases, the projects weren't intended to be commercialized and were mainly for PR, pushing professionals to try new software, etc.
When it's an individual/small business that comes in with a novel concept/idea, wants anticipates filing a patent (confidentiality), and needs to recoup an investment (i.e. design, manufacturing, legal, marketing, distribution, etc.), the engineering and CAD contests may be a difficult sell for prospects. If a designs wind up in the public domain, it may invalidate patent applications, or make a product less distinctive before it's hitting the shelves (or crowdfunding sites), which is why contests typically are closed in nature.
Giving value back to the CAD designers/engineers that participant on the platform is super important to me personally. At the moment, we're working hard on developing an open 3D CAD library that allows community members to easily share their innovative 3D designs/CAD files, embed work, learn new skills, and receive peer feedback. Hopefully, it contributes to everyone's continued development.
Added a screenshot of the upload page below if you're interested in commenting Ideally, it'll have a beta launch soon :)