Second season is very good. They keep it fresh. They end the second season in a way that ties up a lot of loose threads.
So, the series could end on that note if they wanted. A third season promises new material, by saying that their job is only just begun.
Just a note on Shapeways. When I upload a file, it goes into my Shapeways inventory immediately. When I uploaded this file, it did not go into my inventory. It just disappeared. I uploaded it again and got the same results. I checked back the next morning and it was there. I believe my file was automatically FLAGGED as "dangerous" and needed manual approval from Shapeways.