True Cast Resin is a wax-filled SLA resin from Formlabs engineered for precision investment casting. It is designed for a wide range of applications including medium and heavy jewelry, medallions, figurines, and complex engineering components up to 5 mm thick. It delivers highly accurate parts with exceptional detail and smooth surfaces.

True Cast Resin is compatible with the Form 4 and Form 4B printers. It works with the Form 4 Resin Tank and either the Form 4 Build Platform or Form 4 Flex Build Platform.

Each castable resin is optimized for different applications. Castable Wax Resin is best suited for ultrafine structures such as wire filigree and lightweight jewelry, where its high green strength ensures excellent shape retention in thin patterns. True Cast Resin covers medium to heavy jewelry, medallions, figurines, and engineering components up to 5 mm thick. Clear Cast Resin is recommended for larger, more demanding engineering geometries thicker than 3 mm when used with latticing software.

No. For ultrafine structures such as wire filigree and lightweight jewelry, Formlabs recommends Castable Wax Resin instead, which offers the high green strength needed for thin, delicate patterns.

True Cast Resin has an ash content of just 0.03%, low thermal expansion (174.2 μm/m/°C), and minimal shrinkage. These properties work together to ensure a clean burnout and consistently excellent casting outcomes. Printed parts also maintain surface integrity with no wax migration or residue over time.

True Cast Resin produces crisp features, smooth surfaces, and superior dimensional accuracy, enabling highly detailed cast parts. The minimum layer thickness is 25 microns, allowing fine detail resolution across a range of intricate geometries.

No. True Cast Resin is formulated to integrate easily into a wide range of existing investment casting burnout schedules, making it straightforward to adopt in established workflows. Detailed steps are covered in the application guide.

Post-processing involves two main steps. First, wash the part using isopropyl alcohol or an ether-based solution to remove uncured resin from the surface. Formlabs Form Wash or Form Wash L are both compatible. Second, post-cure the part using a Form Cure or Form Cure L unit. Post-curing is essential for parts to achieve their full strength and intended functional properties by completing the chemical reaction initiated during printing.

Wash time settings are available on the Formlabs support site for Form Wash and Form Wash L. Cure settings are available separately for Form Cure V1, Form Cure V2, Form Cure L V1, and Form Cure L V2.

Formlabs provides a dedicated application guide covering design guidelines, post-processing steps, and casting workflow recommendations. You can also download the True Cast Resin Technical Data Sheet for detailed material specifications.

You can request a 3D printed True Cast Resin sample part shipped directly to your office to assess part quality firsthand. For pricing information or bulk order inquiries, contact the Formlabs sales team.