Alumina 4N Resin is a high-density and high-purity technical ceramic used in situations where metal and polymers would fail. Given its unusual and specific properties, it's important to follow Formlabs guidelines when designing, printing, and firing Alumina 4N Resin.

To learn more about the performance or specific material properties of Alumina 4N Resin, refer to the safety data sheet (SDS) and technical data sheet (TDS). Always consult the SDS as the primary source of information to understand safety and handling of Formlabs materials.

Like conventional ceramic materials, Alumina 4N shrinks during the firing process. Parts shrink approximately 21.8% across the X and Y axes and 26% across the Z axis when using the Formlabs recommended firing schedule. Use CAD software to scale your part to account for shrinkage before uploading models to PreForm.

If possible, orient parts to be self-supporting, with all angles less than 30º. Overhangs at a higher degree may cause warping. Avoid orientations that result in a sudden change in surface area or cavities in models facing upwards as this may cause cupping. Print parts so that the major dimensions are along one of the major axes of the print.

When printing with supports, orient models parallel to the build platform.

Formlabs recommends a touchpoint size of 0.4–0.8 mm, with 0.5 mm touchpoints preferred. Avoid placing touchpoints on critical surfaces, as this may cause cracks and or tear thin features. Walls with angles greater than 45º need very few supports.

When using Alumina 4N Resin with a Form 3, use rafts and do not print directly on the build platform.

Parts printed on the Form 4 can be printed directly on the build platform.

Avoid unsupported horizontal overhangs or bridges larger than 0.5 mm. The minimum unsupported overhang angle is 30º.

• Alumina 4N Resin Quick Start Guide
• Troubleshooting issues with parts printed in Alumina 4N Resin
• Printing and firing Alumina 4N Resin
• Recommended tools and supplies for Alumina Resin 4N