A new study published on October 27, 2026, found substantial differences in the mechanical properties of a flexible photopolymer resin printed using DLP and LCD-based MSLA systems. The MSLA specimens recorded higher tensile strength and stiffness under the study's laboratory conditions.
Does that mean LCD is automatically the better technology for flexible resin 3D printing? No. Higher tensile strength does not necessarily translate into better cushioning, elastic recovery, impact protection or long-term durability. Those properties must be evaluated independently for the intended application.
The findings are relevant to how engineers interpret material data, select printing processes and plan mechanical testing. They do not establish the superiority of one printing technology across all flexible resins.
What Did the October 2026 Study Discover?
Published in the journal Progress in Additive Manufacturing, the study compared three groups of specimens: a commercially available flexible dental photopolymer printed using digital light processing (DLP), the same resin printed using masked stereolithography (MSLA), and conventional thermoformed ethylene vinyl acetate (EVA).
The researchers used specimens with a standardized final thickness of 4 mm. The printed groups were prepared using different commercial printing systems and their respective processing parameters.
Among the mechanical measurements, tensile strength produced a particularly noticeable difference.
Mean tensile strength
Mean tensile strength
Mean tensile strength
Results reported by Hassim et al. (2026). These are experimental results for the specific materials, systems and conditions evaluated, not specifications or test results for Yidimu equipment.
A Closer Look at the Mechanical Data
| Property | MSLA / LCD | DLP | EVA |
|---|---|---|---|
| Tensile strength | 39.3 MPa | 22.6 MPa | 7.3 MPa |
| Tensile elastic modulus | 705.8 MPa | 289.1 MPa | 13.2 MPa |
| Flexural strength | 69.2 MPa | 16.7 MPa | 5.6 MPa |
| Fracture toughness | 1.50 MPa·m1/2 | 1.41 MPa·m1/2 | 1.35 MPa·m1/2 |
Values are reported group means. Mechanical tests used 10 specimens per group for each test category. The experimental groups also differed in material class when printed resin was compared with thermoformed EVA. Fracture toughness values require particular care when comparing crosslinked photopolymers with ductile, viscoelastic EVA.
All three groups showed statistically significant differences in the reported mechanical measurements. However, the meaning of those differences depends on what a component is actually required to do.
Why Stronger Does Not Always Mean Better
Engineers frequently use tensile strength as an initial material selection criterion. It describes the maximum tensile stress a specimen sustains in a specified test before failure.
But flexible components are rarely selected on tensile strength alone.
Strength and Stiffness Are Different Properties
Tensile strength describes resistance to failure under tension. Elastic modulus describes resistance to elastic deformation.
A material with a high modulus generally requires greater stress to achieve the same small elastic strain, within the conditions where that modulus is applicable.
This distinction matters because many flexible parts are designed to deform under load.
A cushioning pad, for example, must provide an appropriate force-deflection response. Excessive stiffness may reduce the available deformation under a particular load, even when the material has excellent tensile strength.
Higher Stiffness Is Not Proof of Better Impact Absorption
Impact cushioning involves more than the ability to resist deformation. Energy absorption, damping, loading rate, recovery and the available deformation distance can all influence the response.
Two materials with similar tensile strengths may behave differently under rapid compression or repeated loading.
The October 2026 study did not directly measure dynamic impact absorption, damping, repeated-load fatigue or long-term functional performance. Its static mechanical results therefore cannot establish which material would provide better cushioning or impact protection.
Engineering takeaway: A strong flexible resin may be suitable for a load-bearing or deformation-resistant component. A softer material may be preferable for a part designed to deform under a controlled load. The correct decision depends on the complete mechanical response, geometry and operating conditions.
DLP vs LCD: What Actually Influences the Results?
DLP and LCD/MSLA are both vat photopolymerization technologies. They selectively cure liquid photopolymer resin with light, building the object layer by layer.
The principal difference is how the light pattern is delivered.
| Feature | DLP Printing | LCD / MSLA Printing |
|---|---|---|
| Light delivery | Projected image generated using a digital micromirror device | UV light selectively transmitted through an LCD mask |
| Layer exposure | Image projected across the layer | Masked exposure across the layer |
| Process variables | Projected irradiance, exposure settings, optical configuration and separation mechanics | Light uniformity, LCD transmission, exposure settings and separation mechanics |
| Mechanical properties | Depend on the complete combination of resin, equipment, exposure, geometry and post-processing | |
The Study Compared Complete Printing Systems
An important methodological detail is that the researchers did not isolate the light-delivery mechanism while keeping every other variable identical.
Both printed groups used the same commercial resin, a nominal layer thickness of 50 µm and an 80° printing orientation. However, they were produced on different machines using system-specific printing parameters.
The DLP group used recommended resin-processing settings. For the MSLA group, the researchers developed suitable parameters through preliminary optimization because a predefined profile was unavailable.
Differences in exposure, equipment configuration, software and processing conditions may therefore have contributed to the resulting mechanical properties.
The data show how two specific commercial workflows performed. They do not prove that LCD technology intrinsically produces stronger flexible parts than DLP technology.
For a broader explanation of the different light-curing architectures, see Yidimu'sSLA vs DLP vs LCD resin 3D printer comparison.
What This Means for Flexible Industrial 3D Printing
The study was designed around candidate materials for dental protective appliances. Its findings should not be directly transferred to footwear, robotics or other industrial products without application-specific testing.
Nevertheless, the underlying engineering lesson is useful: a material's measured mechanical strength is only one part of the selection process.
Footwear and Lattice Cushioning
In printed footwear, the force-deflection response is influenced by both the elastomer and the lattice geometry.
Cell topology, strut thickness, wall geometry, local density and material recovery can influence compression behavior.
A higher tensile-strength resin does not automatically produce a more comfortable or durable shoe component. Compression curves, rebound, compression set and cyclic loading provide more relevant information for many cushioning decisions.
For the complete development workflow, seehow 3D printed shoes are designed, printed and tested.
Soft Robotics and Flexible Components
Flexible robotic components may require repeated bending, controlled deformation, recovery or movement around adjacent parts.
A material with high initial stiffness may resist deformation more strongly, while a softer material may allow greater movement under the same applied load.
Neither behavior is inherently superior. Material selection must reflect the component's function, allowable strain, recovery requirements and expected operating conditions.
Protective Pads and Flexible Fixtures
Protective pads and flexible fixtures can have competing requirements. Some designs prioritize deformation and energy dissipation; others require dimensional stability or resistance to local loading.
Rather than selecting the resin with the highest reported strength, development teams should define measurable acceptance criteria for their finished components.
How to Evaluate Flexible Resin Before Production
A practical material comparison should separate the properties of a standardized test specimen from the performance of a finished component.
The following evaluation sequence can help engineering teams avoid attributing every difference to the printer or resin alone.
Suggested Material Evaluation Matrix
| Application | Primary Question | Useful Evaluation |
|---|---|---|
| Lattice cushioning | Does the structure deform and recover as required? | Compression response, rebound, set and cyclic loading |
| Soft robotic component | Can repeated movement occur without unacceptable degradation? | Bending, repeated strain, recovery and functional cycling |
| Flexible fixture | Does the part maintain acceptable geometry under load? | Load-deflection, dimensional stability and repeated-use testing |
| Protective padding prototype | Does the component provide the intended response under representative loading? | Compression and application-specific impact testing |
These are suggested engineering evaluation categories, not results from the cited research. Formal testing methods should be selected for the actual material and product. For example, ASTM D638 addresses tensile properties of plastics, while ASTM D575 and ISO 7743 address specified compression measurements for applicable rubber materials.
Where Yidimu Flexible Resin Printing Fits
Yidimu develops resin 3D printing equipment and provides material and application support for industrial users evaluating flexible structures.
The Yidimu Flex G2 is a 14-inch masked light-curing system intended for elastomer-related applications, including lattice structures, footwear prototypes and flexible engineering components.
Its documented configuration includes a 302 × 162 × 370 mm build volume and a 405 nm UV exposure system. These specifications describe the machine, not the mechanical performance of a finished part.
Flex G2 was not one of the systems evaluated in the October 2026 study. No direct comparison or equivalent mechanical performance should be inferred from the research data.
For practical project assessment, the appropriate starting point is the intended component: its geometry, loading requirements, material behavior and post-processing workflow.
Frequently Asked Questions
Is LCD stronger than DLP for flexible resin printing?
Not as a universal rule. The October 2026 study measured higher tensile strength in its MSLA group, but the experiments used two different commercial systems and processing settings. Other resins, equipment and workflows may produce different results.
Does higher tensile strength mean better flexibility?
No. Tensile strength is resistance to failure under tensile loading. Flexibility depends on deformation behavior, while elastic recovery, damping and fatigue resistance describe additional performance characteristics.
Can tensile strength predict the cushioning performance of a 3D printed shoe?
Tensile strength alone cannot predict cushioning. The finished structure should be evaluated under representative compression and dynamic loading conditions, with attention to geometry, recovery and repeated use.
Can these research results be applied to all flexible resins?
No. The printed specimens used one commercial flexible dental photopolymer and specific machine workflows. Different resin chemistries, exposure conditions and post-curing procedures may produce substantially different properties.
Does the study prove that printed resin is better than EVA for mouthguards?
No. The study established baseline static mechanical differences between the tested materials. It did not establish superior clinical protection, fit, wearer comfort, energy absorption or long-term intraoral durability.
The Engineering Conclusion
The October 2026 research offers a useful reminder: higher measured strength is not the same as better functional performance.
The MSLA specimens achieved higher static mechanical values than the DLP specimens under the evaluated conditions. That is a meaningful experimental finding, but it should not be used as a universal ranking of printing technologies.
For flexible industrial components, successful material selection requires a connection between resin properties, equipment settings, part geometry, post-processing and the loads the component must withstand.
If you are developing a flexible lattice, cushioning structure or other elastomer component, contact Yidimu with your 3D model, intended application, dimensions, target mechanical behavior and production requirements to discuss suitable equipment, material matching and sample evaluation.
References
Hassim, N., Rahimi, S. N., Rokhani, F., et al. (2026). "Comparison of the mechanical properties of a flexible 3D-printed resin fabricated using DLP and MSLA vat photopolymerization systems with thermoformed ethylene vinyl acetate."Progress in Additive Manufacturing.Published October 27, 2026.https://doi.org/10.1007/s40964-026-02006-x
ASTM International. ASTM D638 — Standard Test Method for Tensile Properties of Plastics.ASTM D638
ASTM International. ASTM D575 — Standard Test Methods for Rubber Properties in Compression.ASTM D575
International Organization for Standardization. ISO 7743:2017 — Rubber, vulcanized or thermoplastic — Determination of compression stress-strain properties.ISO 7743:2017