Formlabs Rigid 4000 Resin is an advanced photopolymer tailored for Formlabs’ SLA 3D printers. With a tensile strength ranging from 60-75 MPa and a Heat Deflection Temperature between 80-100°C, Rigid 4000 stands out for its high stiffness combined with impressive impact resistance. Perfect for demanding engineering tasks like structural components and load-bearing parts, it offers both durability and a high-quality aesthetic finish.

Physical Properties

  • Density: Typically around 1.15–1.25 g/cm³
  • Tensile Strength: Generally falls in the range of 60-75 MPa, contingent on post-curing processes
  • Heat Deflection Temperature: Usually between 80-100°C after proper post-curing

Aesthetic Quality

Formlabs Rigid 4000 Resin produces prints with a smooth, high-quality surface finish. The material is often available in light or neutral colors, suitable for both functional and aesthetic applications. Its ability to capture fine details makes it well-suited for intricate designs.

Durability and Usage

This resin is engineered for high-stiffness and impact-resistant applications. It is especially suitable for structural components, enclosures, and load-bearing parts where rigidity is a key requirement. The material’s unique formulation provides a high level of stiffness without sacrificing impact resistance, making it versatile for various engineering applications.


The typical post-processing workflow includes cleaning the print in a solvent (commonly isopropyl alcohol) to remove any remaining uncured resin, followed by UV curing to enhance its mechanical properties. The material can also be sanded, machined, and painted, and it generally adheres well to common types of adhesives and coatings.

Environmental Impact

As with most SLA resins, Formlabs Rigid 4000 is not biodegradable and requires special disposal methods to minimize its environmental impact. The material is also derived from non-renewable resources, so it is less eco-friendly compared to bio-based materials like PLA. Responsible use and disposal are essential to mitigate its ecological footprint.

In summary, Formlabs Rigid 4000 Resin offers a specialized, high-performance material designed for applications requiring high stiffness and impact resistance. Its excellent mechanical properties make it a popular choice for engineers and professionals requiring high-quality, durable parts. Although its environmental impact is a consideration, the performance attributes make it invaluable for specialized and high-demand tasks.

Formlabs Rigid 4000 – Technical Data Sheet