Hey everyone!
Ok, after more interactions with shapeways, I think I have some pretty stable updates to share.
Although the printing checks seems to be becoming more stringent, most models will not be blocked outright if successfully printed before. Further check might be done, but the situation is definitely not as critical as it appeared at first.
Furthermore, shapeways is testing a function called "Print it anyway", that will allow designers (and if everything goes right, customers too) to buy prints of models even if they do not pass all the checks. They will not guarantee the perfect quality of the model, but it will allow to purchase basically any model.
This said, I've convened with shapeways not to close my shop; in the next days, I'll add to the description of my models the following, to inform all my customers of the situation:
"PLEASE NOTE: These models bear some very delicate detail, and push the limits of the printing material; sometimes it can happen that during the tests the models will result to be not printable, even though they have been printed successfully before. Should this happen, I'll do my best to solve the issues promptly and keep you updated."
With this fixed, I'll hopefully be able to get back to sculpting
All is well that ends well(-ish)!
)