Bill is absolutely correct - seeing a failure is extraordinarily helpful to help avoid future failures. I recently had several copies of
https://shpws.me/lnj8 delivered to a customer broken. The point of failure got past me, the reviewer, and the print cleaner... but the reason for the failure was obvious to me the moment I saw pics sent to me from the customer.
Purely by the numbers the model was OK.... however, the customer had ordered the model is WSF-Polished, and the engine pods broke off during polishing. I had designed the supports for the engines with well over the amount needed to print OK, and even to withstand the polishing process... but what I didn't take into account was the twisting forces experienced by polishing media was enough to torque the engines right off. This wasn't a case of having sufficient wall thickness - it was a case of the design in 3D looking perfectly OK on screen, but real-world forces proving otherwise.
I was (hopefully) able to correct the problem by adding 2 more supports farther off the center axis. This should stop that part from rotating and thus from being twisted off.
I bring this case up specifically because, if the failure had been reported to me in the standard Shapeways blue-model-red-circle "might break" minimal communications failure email, I'd never have figured out what the issue was.
I still have not been notified by shapeways of that failure, however. I did update the model a few minutes after the customer contacted me and he sent me a follow-up message later telling me it was being re-printed for him, so we'll see soon if the revised model is the one they are printing, or if they are reprinting the older version.