Digital Light Synthesis (DLS) is Carbon’s groundbreaking resin-based 3D printing technology that uses digital light projection and an oxygen-permeable window to produce parts with exceptional surface quality, isotropic mechanical properties, and production-grade consistency. Originally developed by Carbon (formerly Carbon3D), DLS is also known by its process name CLIP (Continuous Liquid Interface Production). This technology bridges the gap between prototyping and production, delivering end-use parts at speeds competitive with traditional manufacturing.
How Digital Light Synthesis (DLS) Works
DLS works by projecting UV light through an oxygen-permeable window into a vat of liquid resin. Unlike traditional SLA, where curing stops when the light turns off, DLS uses oxygen as a polymerization inhibitor. Oxygen permeating through the window creates a “dead zone” — a thin layer of uncured resin just above the window surface. This prevents parts from sticking to the window, enabling a continuous printing process without the “peel” step required in SLA. A build platform rises continuously as the part is drawn out of the resin vat, with light projected in a sequence of cross-sectional images. The result is a part with no visible layer lines, isotropic properties, and excellent surface finish.
Key Advantages of Digital Light Synthesis
Exceptional Speed and Throughput
DLS is up to 100× faster than traditional SLA due to its continuous printing process. There is no peel step, no pause between layers, and no recoating delay. This makes DLS viable for production volumes that would be impractical with layer-by-layer resin printing.
Isotropic Mechanical Properties
The continuous nature of DLS produces parts with consistent, isotropic mechanical properties — meaning strength, stiffness, and elongation are equivalent in all directions. Parts behave like injection-molded components, without the anisotropic weaknesses that plague layer-by-layer processes. This is critical for functional end-use parts.
Production-Grade Materials
DLS materials are engineering-grade polyurethane and epoxy-based resins developed specifically for end-use applications. They offer properties comparable to ABS, polypropylene, and thermoplastic polyurethane, with excellent durability, chemical resistance, and temperature performance.
Excellent Surface Finish and Resolution
DLS parts exhibit smooth, layer-free surfaces with resolution down to 75 microns. The continuous process eliminates the stair-stepping effect visible in layer-based printing, producing parts that require minimal post-processing for most applications.
DLS 3D Printing Materials
| Material | Propiedades clave | Aplicaciones típicas |
|---|---|---|
| RPU 70 (Rigid Polyurethane) | Tough, stiff, ABS-like, HDT 70°C | Consumer product housings, automotive interior components, electrical enclosures |
| FPU 50 (Flexible Polyurethane) | Semi-rigid, high impact, PP-like | Living hinges, snap-fits, cushioning components, protective cases |
| EPU 40/41 (Elastomeric PU) | High resilience, tear resistant, Shore 68-72A | Footwear midsoles, gaskets, seals, vibration dampeners, grips |
| SIL 30 (Silicone) | Biocompatible, soft, Shore 35A, tear resistant | Medical devices, wearables, earbud tips, patient-contact components |
| EPX 82 (Epoxy) | High strength, high stiffness, HDT 115°C | Structural components, under-hood automotive, tooling, connectors |
| MPU 100 (Medical PU) | ISO 10993 certified, sterilizable, durable | Surgical instruments, medical device housings, drug delivery devices |
Common Applications of Digital Light Synthesis
- Footwear: Production midsoles with lattice geometries, custom-fit insoles, performance footwear components
- Automóvil: Interior trim, HVAC components, electrical connectors, under-hood brackets (with EPX 82)
- Medical and Dental: Surgical instruments, dental models, custom prosthetics, patient-specific devices
- Consumer Electronics: Protective cases, earbud components, wearable device housings
- Industrial: End-of-arm tooling, vibration dampeners, seals and gaskets, production jigs
- Sporting Goods: Helmet padding with lattice structures, grip components, protective gear
DLS vs Traditional SLA and SLS
DLS shares some operational similarities with SLA (both use UV-curable resins), but DLS delivers significantly higher speed, better mechanical isotropy, and production-grade materials that SLA cannot match. For applications requiring elastomeric or impact-resistant properties, DLS with EPU or FPU materials provides capabilities beyond what SLS can achieve. However, for high-volume production of rigid nylon parts, SLS and MJF remain more cost-effective due to lower material costs and higher build throughput.
Preguntas frecuentes
What is the typical build volume for DLS 3D printing?
The Carbon M2 printer offers a build volume of 189 × 118 × 326 mm, while the larger Carbon L1 provides 406 × 305 × 406 mm. The tall build height on the M2 is particularly useful for producing multiple small parts stacked vertically in a continuous build.
How fast is DLS compared to traditional SLA?
DLS can be 25-100× faster than traditional layer-by-layer SLA depending on part geometry. A build that takes 10 hours on SLA can often complete in 30 minutes to 2 hours on DLS. The speed advantage is most pronounced on solid, dense parts and least visible on thin-walled, sparse geometries.
Do DLS parts require post-curing?
Yes, DLS parts require a thermal post-cure bake to achieve their full mechanical properties. This bake typically takes 4-12 hours depending on material and part geometry. After baking, parts may require support removal, but the surface finish is generally ready for use without additional sanding or finishing.
What is the typical lead time for DLS parts?
DLS standard lead times are 5-10 business days, reflecting the printing speed plus required thermal post-curing time. Small, thin parts can often ship in 3-5 days. Rush services are available for time-critical projects, with 2-3 day turnaround possible for eligible parts.