The Form2 is a lot bigger than the Form1+, and it adds a wiper that helps keep the PDMS layer refreshed, but at a certain cost in speed. They wouldn't trade in my Form1+, so I haven't tried it myself. But feedback in their forum suggests it's still not 100% reliable, and you have to use their materials preloaded into cartridges - they won't let you use 3rd-party materials on the Form2, although it's possible with the Form1+/

If you're printing jewelry it will take more resin to keep the tank full, but you can do more patterns at a time. Formlabs recently introduced a castable resin, but I haven't tried burning it out yet. The usage guide on their site https://support.formlabs.com/hc/en-u...Castable-Resin suggests several things you're probably doing already, like using Plasticast investment, bringing it up to a higher-than-normal temperature, holding it at the hottest temp for a while, and introducing a little air into the kiln to combust the residual ash.