This is a really interesting and burning question. I also bought the Form 3 for a purple resin print with further casting, but I ended up using almost the entire resin cartridge, a couple of bags of molding material and only got 100% disappointment.
One can start by saying that Form 3 prints this resin very poorly. Geometric (flat) products have a very poor surface, but even this is not the worst, since the main reason is that I could not completely burn out this resin even at a temperature of 950 degrees Celsius. I kept the flask at this temperature for 3 hours.
After these experiments, I bought a “PHOTON Mono” printer on Aliexpress for 200 euros and used Blucast10 resin. Yes, this printer has its own problems when printing, but they are predictable, since these are problems associated with the technology of illumination of the entire layer at once and they can be predicted. But the resin has shown itself from a very good side, both in printing and in casting. Even if not all of my castings are perfect, the photo shows a ring that weighs 40 grams and it spilled out of silver just perfect. I would really like Formlabs to come to terms with its ambitions in the development of resin for jewelers and, together with Blucast, developed a resin and a mode for Form 3, then I would be pleased with the purchase of this printer, but at the moment I would not advise my friends to do this the same mistake I made by purchasing this printer.