Going to give an upvote to Javelin, or as he sometimes calls himself, National Cheese Emporium. High quality STL sculptor, and with little to no issues with printing, he ran an excellent service on Shapeways Marketplace ( Much mourned) and now on Cults3D and CGTrader.
He is reliable as a seller, and will even take suggestions - He upscaled one of his 3mm models to 6mm on my request.
I don't have any of his Imperial Skies items, but I have had my eye on his civilian ships for some conversion potential for DW.