sent Model Monkey with a link to your post as he uses a gray resin on his stuff but I don't know if same as what you are wondering about.
about Gray PA-12 plastic? I looked it up online, got some technical info, but it's not translating for me into how good a model I might get.
A good number of years back, I did two "experimental buys" from Shapeways, which were in monetary amounts I was willing to risk, and which I consider successful/worth it for what I learned.
1) While white natural plastic may be comparable to the price of a plastic kit, the quality is definitely NOT. It is inferior. I will not purchase this kit in that material.
2) The smooth fine detail material IS of good quality. However, in this case, I don't want the model badly enough to spring for it at that price.
3) The reputation of the creator is important. Shapeways only does the printing. If the design is not good, the material, and everything else is irrelevant. My understanding of Dutch Fleet is that his reputation is fine. I have no reservations here.
So... I trust the designer/design. I trust the most expensive material, but don't like the price. The middle alternative is an unknown to me. More money than I want to experiment with. If I were certain of the material, then I could see myself consenting to the price. "Time is money." No other model of this is likely to be out for about 6 years. Might be worth it to me, then, if I could trust I would get a quality product.
So... Anyone have any experience with this Gray PA-12 plastic? TIA
There is a 3D printed model by DFNM in 1/700:
Constellation class FFG