I'm still selling 1/350 scale SSN screws (propellers) on eBay (mulsannemike) The current inventory includes:
LA 688 SSN, Ohio SSBN/SSGN, Type 212 SS, Oscar II SSGN, Delta IV SSBN, Mike SSN, Papa SSGN, Kilo SS, Resolution SSBN, HMS Trafalgar SSN, Kilo, Sturgeon SSN, Benjamin Franklin SSBN, Permit/Thresher SSN , USS Jack SSN 605, Skipjack SSN, Nautilus SSN, Tullibee SSN, Scorpene SS, and more.
My screws correct observed deficencines in the shape and execution of currently modeled 1/350 scale screws for those models. I'm printing these at home, and selling them on eBay, because I can actually print thinner on the home machine (.3 mm unsupported). And as there isn't high demand, I can keep up with it.
I get a ton of scaling requests. With large swings in scale, going from a smaller existing scale to a larger scale, you fall out of Shapeway's reasonable price box. What happens is it flips a switch in their algorithm and suddenly what is $19 in 1/192 is $260 in 1/72. That's a more than 2.5 X increase, though as you see the price increase isn't linear as the volume increase is logorithmic, and the price jump makes sense. So small scale moves have a better chance of being economically feasible. But that has its issues too, this one CAD techincal: I draw bespoke to the scale I'm working in. So if I'm working in 1/350, the smallest/finest details will be measured against Shapeway's .3 mm/.6 mm wall thickness minimums. And if I get a request to go smaller in scale, sudenly I'll have areas of the model that aren't compliant with Shapeway's minimums and the model gets rejected. I learned that lesson with the Portsmouth and Electric Boat Sails I scaled down to 1/700. I had to completely loose all the masts as they wouldn't even accept them at .6 mm diameter (don't ask me, suddenly they're considering those "wires" and that has to have a minimum of .8 mm and they look gooofy that beefy). Thus understand that I am no longer considering scaling requests if they're beyond a reasonable increase. So what's a unreasonable increase? Most. Most of your requests just aren't doable.
I'm always open to suggestions. In fact the back and forth with you guys is pretty inspiring. But I can't do everything, and there's the "interest threshold." If I'm not into it, it probably won't happen. But if I am immediately, it probably will. However, timing is always an issue. So if you've contacted me and I've been interested, just wait.