Resin 3D models are made from liquid photopolymer resins via SLA/DLP printers, while PETG models use thermoplastic PETG filament with FDM printers.
Resin models have finer details and smoother surfaces but are more brittle. PETG models are durable, flexible, and easier to post-process for functional uses. Resin suits detailed items like miniatures or jewelry prototypes; PETG works for enclosures or mechanical components.
Choose resin for highly detailed decorative pieces, and PETG for long-lasting, practical items.