Lost resin casting
Castable photopolymer holds fine detail, but burnout depends on chemistry, cure, geometry, shell, and schedule.
Lost resin casting uses a photopolymer-printed expendable pattern. It is useful for small detailed work, jewelry-scale forms, and geometry that benefits from resin printing.
Not every resin is castable
Ordinary resin may expand, char, leave ash, or crack investment. Castable formulas burn more cleanly, but each behaves differently. Washing, complete post-cure, wall thickness, trapped resin, and drainage affect the result.
A beautiful print can be a bad pattern if it cannot drain or burn out. Cup-like forms trap liquid; thick regions stress shell; hidden uncured resin can cause failure.
Treat it as a system
Match resin, investment or shell, geometry, and burnout through documented tests. Record printer, exposure, cleaning, cure, shell, kiln ramp, holds, and result. Coupons are cheaper than repeating a sculpture.
Photopolymer and burnout fumes require serious handling and ventilation. Follow manufacturer and foundry guidance rather than one online recipe.