If I understand co-creation correctly, a customer can give their input and the seller customizes (generates perhaps) the model. After upload, the model is then available in the buyer's account. If the buyer has a shop on Shapeways is it then possible for them to re-sell their co-created model? It seems like I've seen co-created objects for sale, but I could be wrong.
I'd like to generate unique models from and algorithm I created for each order. It would be nice to have a co-creator setup that didn't require any input for this purpose. If these were not re-sellable they could have a sort of limited edition quality.
If you set the model in your shop to "Public" then it would be available to all.
If you don't, then only the people that you share the link with would be able to buy it. That would include the original buyer sharing the link with a second person.
What you could do is once the item has been printed and delivered, is just delete the model from your shop.Patience, Persistance, Politeness - the 3Ps will help us get us to Perfect Printed Products