Not sure what printer you are using, but I find that the free version of Chitubox works pretty nicely and can be set up for many resin printers. Has a feature that will hollow out a large solid object, you can 'drill' holes for the resin to drain out, and you can add internal cross bracing if you want. Saves a lot of resin.
You can also rescale the whole object easily (using HO models and printing in O for example) or even changing one dimension while keeping the others the same (like shrinking a boiler)
Jim
