SLA Resin · Industrial 3D Printing

Rigid 10K Resin

A highly glass-filled stereolithography resin built for extreme stiffness. Rigid 10K simulates the rigidity of machined thermoplastics and metal tooling, holding its shape under sustained load and heat where standard resins would deform.

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88 MPa

Tensile Strength

High load capacity

9.9 GPa

Flexural Modulus

Metal-like stiffness

238 °C

Heat Deflection

@ 0.45 MPa thermal rating

0.7%

Elongation at Break

Rigid, not flexible

Real Rigid 10K Parts

Actual Formlabs SLA prints in Rigid 10K Resin, not renders.

Rigid bracket-style fixture 3D printed in Formlabs Rigid 10K Resin, shown in the standard matte off-white finish — A jig-style bracket printed in Rigid 10K, holding tight tolerances under clamping load.

Formlabs Rigid 10K Resin injection molding insert next to the red thermoplastic part it molded — A Rigid 10K injection molding insert alongside the thermoplastic part it produced.

Summary & Key Takeaways

Metal-Like Stiffness: A 9.9 GPa flexural modulus resists bending and deformation under sustained load or clamping pressure.
High Heat Resistance: Withstands 238°C at 0.45 MPa, suited to hot tooling and injection molding masters.
Rigid, Not Ductile: Only 0.7% elongation at break; excels at stiffness, not at flexing, snap fits, or impact.
Tooling Without Machining: Replaces machined aluminum jigs, fixtures, and short-run injection molds at a fraction of the lead time.

Compare Rigid 10K to Other 3D Printing Materials

A quick, scannable comparison against alternative 3D printing materials and processes. All values are shown at once; use the buttons to focus on one comparison at a time.

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Tensile strength, flexural modulus, elongation at break, and support requirements for Rigid 10K Resin versus Rigid 4000 Resin, Tough 2000 Resin, and SLS Nylon 12.
Property	Rigid 10K	Rigid 4000	Tough 2000	Nylon 12 SLS
Tensile strength	88 MPa	69 MPa	46 MPa	50 MPa
Flexural modulus	9.9 GPa	3.4 GPa	1.9 GPa	1.8 GPa
Elongation at break	0.7%	5.3%	48%	18%
Support structures	Removable supports for overhangs	Removable supports for overhangs	Removable supports for overhangs	None required

Why Choose Rigid 10K Resin?

A highly glass-filled SLA resin offers core engineering advantages over standard resins and machined tooling alike.

Machining-Free Tooling Stiffness

A 9.9 GPa flexural modulus rivals machined thermoplastics and aluminum tooling, letting injection molding inserts, jigs, and fixtures hold dimension under clamping and molding pressure without warping.

High Heat & Chemical Resistance

A 238°C heat deflection temperature at 0.45 MPa lets Rigid 10K parts sit near hot injection-molded plastic melt streams and resist common mold release agents without softening.

Precision Tooling, No CNC Lead Time

Fine SLA detail resolution captures thin ribs, sharp mold-parting lines, and small features directly from CAD, replacing CNC-machined masters and metal inserts for short-run and low-volume tooling.

Rigid 10K Design Rules (DFM) at a Glance

Formlabs SLA design guidelines for Form 3 and Form 4 generation printers. Check your CAD feature dimensions against these limits before uploading your file.

Min. wall thickness (supported)	1.0 mm
Min. wall thickness (unsupported)	1.0 mm
Min. embossed detail	0.1 mm
Min. engraved detail (width & depth)	0.15 mm
Min. hole diameter	0.5 mm
Min. drain hole diameter	2.5 mm
Clearance between separate or moving parts	0.5 mm min
Max. unsupported overhang	5.0 mm · 10° min. angle from level
Max. single-part build size	353 × 196 × 350 mm

Formlabs Rigid 10K Resin sample cards showing the standard matte, off-white as-printed surface finish and texture options — Rigid 10K sample cards showing the standard matte, off-white as-printed surface finish.

Source: Formlabs SLA design specifications for Form 3 / Form 4 generation printers, adapted for Rigid 10K's glass-filled, brittle composition. Because thin walls and sharp corners are more prone to cracking in Rigid 10K than in standard or tough resins, we hold it to a higher minimum wall thickness than Formlabs' general SLA guidance. Maximum build size reflects our largest-format SLA printer; actual build size depends on which machine your order routes to.

Frequently Asked Questions

Everything you need to know about designing, ordering, and using Rigid 10K parts on Form Now.

What is Rigid 10K Resin?

Rigid 10K Resin is a highly glass-filled stereolithography (SLA) resin from Formlabs engineered for extreme stiffness and heat resistance. It is designed to simulate the performance of glass-filled thermoplastics and machined metal tooling for functional prototypes, jigs, fixtures, and injection molding masters.

How stiff and strong is Rigid 10K Resin?

Rigid 10K Resin has an ultimate tensile strength of 88 MPa and a flexural modulus of 9.9 GPa, among the stiffest materials Formlabs offers. This combination gives parts metal-like resistance to bending and deformation under sustained load or clamping pressure.

What is Rigid 10K Resin used for?

Rigid 10K Resin is commonly used for injection molding tooling (molds, inserts, and masters), thermoforming and blow molding molds, jigs and fixtures, aerodynamic test models, and functional prototypes that must hold dimension under heat or mechanical load.

Is Rigid 10K Resin brittle, and can it flex?

Rigid 10K Resin has an elongation at break of only 0.7%, meaning it is stiff and brittle rather than ductile. It is not suitable for parts that need to flex, bend, or absorb impact, such as snap fits or living hinges; those applications are better served by a tougher material like Nylon 12 or Tough 2000 Resin.

What finish do Rigid 10K parts arrive in?

Form Now Rigid 10K parts ship in the standard finish: rinsed and post-cured, with excess uncured resin removed, leaving a matte, off-white to cream surface. Any additional finish options for a given order are shown during part configuration at checkout.

What are the minimum wall thickness and hole size design rules for Rigid 10K?

Per Formlabs' SLA design specifications for Form 3 and Form 4 generation printers, we recommend a minimum wall thickness of 1.0 mm for both supported and unsupported walls, and holes should be at least 0.5 mm in diameter. Because Rigid 10K is a glass-filled, brittle resin rather than a ductile one, thin walls and sharp corners are more prone to cracking than in standard or tough resins, so it is especially important to stay at or above this thickness for load-bearing or handled features. Maximum single-part build size is 353 x 196 x 350 mm.