Digital Light Processing (DLP) Providers
Digital Light Processing projects an entire layer of UV light onto photopolymer resin using a digital projector, curing each layer simultaneously for faster build speeds than point-by-point SLA. DLP delivers high accuracy and smooth surfaces, making it popular for dental aligners, jewellery, and micro-scale components. Browse DLP providers on ForgedLink verified for resolution, material range, and finishing quality.
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How Digital Light Processing works
DLP is a vat-photopolymerisation process closely related to SLA, but with a crucial difference in how each layer is exposed. Instead of a laser tracing each layer point-by-point, DLP uses a Digital Micromirror Device (DMD) — a chip with millions of tiny mirrors — to project the entire layer image onto the resin surface in a single flash. Every pixel of the layer cures simultaneously, so build time depends only on layer height and Z-axis kinematics, not part complexity, surface area, or the number of nested parts.
This whole-layer exposure makes DLP extremely fast on small-to-mid parts — for a dental-aligner build filling the platform, DLP systems can produce hundreds of models per day. The trade-off is that XY resolution is fixed by the DMD projector at the build surface: the same chip exposing a small build area gives very fine detail (sub-30 µm pixels), while scaling the projection to a large build area stretches each pixel to 75–150 µm. Modern industrial DLP platforms (Envisiontec / ETEC, Asiga, 3D Systems Figure 4, Carbon, Rapidshape, Uniformation industrial) combine DMD projection with either fixed-high-resolution optics or pixel-shift tiling to balance build area and detail.
Common DLP applications
Clear aligners and dental orthodontics
The highest-volume DLP use case globally. DLP-printed arch models are used as thermoforming masters for millions of clear aligners per year — a market dominated by Align Technology, SmileDirect, and dozens of dental labs running Asiga, 3D Systems, Rapidshape, or Envisiontec platforms.
Jewellery casting patterns
Burnout-clean castable resins on fine-pixel DLP systems produce pattern masters for ring, pendant, and bespoke jewellery casting. Faster builds than SLA make DLP the go-to for production jewellery studios.
Hearing aid and in-ear device shells
Custom-fit shells printed from ear-canal scans in biocompatible resin. Millions of hearing-aid shells per year run through DLP processes.
Micro-scale functional parts
Micro-optics mounts, medical-device micro-components, precision fixtures, and MEMS-adjacent hardware where SLS / MJF cannot hold fine features.
Dental models, crowns, and surgical guides
Class I and Class IIa biocompatible resins for surgical guides, temporary crowns, nightguards, and dental study models — under ISO 13485 chains of custody.
Carbon DLS production parts (elastomers + rigids)
Carbon's Digital Light Synthesis variant (a DLP derivative) produces end-use parts for adidas midsoles, Riddell helmet liners, Specialized saddles, and electronics hardware — at volumes reaching millions of units per year.
Materials commonly processed by DLP
Dental Resins (model, surgical guide, tray, nightguard)
The dominant DLP material family by volume. Dedicated dental resins from Keystone / BEGO / SprintRay / DETAX / 3D Systems, validated by lab and manufacturer under ISO 10993 and EU MDR where applicable.
Castable Resins (Jewellery, Precision Casting)
Wax-like photopolymers for clean investment-casting burnout. Widely used by jewellery studios for production casting of rings and fine pieces.
Biocompatible Resins (Hearing Aids, Medical)
Class I (skin contact) and Class IIa (mucosal, up to 30 days) grades — Detax Luxaprint, 3D Systems VisiJet, Formlabs Dental resins (cross-compatible with DLP where optics match).
Engineering / Rigid Resins
Higher-stiffness grades (Envisiontec E-Model Light, 3D Systems Accura, Keystone KeyModel) for fixtures, visual prototypes, and precision dimensional work.
Elastomeric / Flexible Resins (Carbon EPU / SIL / FPU)
Carbon's Digital Light Synthesis enables production-grade elastomer parts (footwear midsoles, protective padding) that compete directly with injection-moulded TPE.
High-Temperature Resins
Heat-deflection temperatures 200–300°C for mould prototyping, layup tooling, and thermal-test fixtures. Examples: Henkel / Loctite 3D 3843, Envisiontec HTM140, 3D Systems Accura AMX Rigid Black.
When to choose DLP over SLA, MSLA, or moulding
DLP vs SLA: DLP wins on throughput for small-to-mid builds — a DLP build of hundreds of small parts can finish in 2–4 hours, where SLA would take 6–12. SLA wins on consistent XY resolution across large build areas (a 300 mm SLA part holds the same detail corner-to-corner; a 300 mm DLP print loses pixel density at the extremes). For dental and jewellery at production volume, DLP is the default; for visual prototypes, microfluidics, and fine-detail work on large parts, SLA is preferred.
DLP vs MSLA: industrial DLP (Asiga, Envisiontec / ETEC, Carbon, 3D Systems Figure 4, Rapidshape) produces tighter tolerances and broader resin compatibility than MSLA. MSLA gives far cheaper per-machine cost but tighter XY limits (small build areas to hit fine detail) and LCD-lifetime constraints (2,000–4,000 hours typical). For production dental / jewellery / audiology, industrial DLP is the default; for hobby, maker, and some low-volume prototype work, MSLA wins on economics.
Carbon DLS vs DLP: Carbon's Digital Light Synthesis is a DLP variant that adds an oxygen-permeable membrane at the bottom of the resin vat (the "dead zone"), enabling continuous-pull printing without the peel cycles that slow standard DLP. Parts come out with no layer lines and near-isotropic properties — the "DLS" product is essentially DLP-class surface finish combined with genuine production-grade mechanicals.
Lead time and cost expectations for DLP
Standard DLP parts typically deliver in 2–4 working days. Rush 24-hour services are widely available at a premium. Dental and jewellery providers running dedicated DLP platforms often offer same-day or next-day turnaround for rush clinical / client work.
Indicative pricing for a 20 cm³ DLP part (single, standard resin): £25–£60 / €30–€70. Dental-specific resins run similar pricing per gram to SLA; castable jewellery resins are usually charged per printed cm³ rather than per part. Carbon DLS production parts run specialised pricing tied to part-design-for-process and annual volume commitments rather than the per-part model of SLA / DLP prototype shops.
Related processes & materials
Frequently asked questions
Is DLP faster than SLA?
For small-to-mid builds — yes, substantially. DLP exposes an entire layer in a single flash, so build time depends only on layer count and Z-axis kinematics, not on part area or complexity. A fully nested DLP build of small parts can finish in a fraction of the SLA time. For very large parts (single objects filling a large build area), SLA can be faster since it scales down laser spot size rather than stretching fixed pixels.
Why is DLP the standard for clear aligner production?
Three reasons: (1) the part (an arch model) is small enough to fit optimal DMD pixel density; (2) hundreds of models can nest on a single build, and DLP's fixed per-layer exposure means build time is essentially independent of part count; (3) dedicated dental platforms (Asiga, Rapidshape, SprintRay) ship with validated dental workflows and software integration for scan-to-print pipelines.
What tolerances are achievable with industrial DLP?
Typical dimensional tolerance is ±0.05 to ±0.1 mm on well-controlled features, with surface roughness of 2–8 µm Ra depending on layer height and resin. High-resolution micro-DLP systems (Asiga Pro 4K, 3D Systems Figure 4 Modular) reach single-micron pixel resolution on small build areas.
Does DLP give better or worse surface finish than SLA?
Comparable — both produce very smooth surfaces (typically 2–5 µm Ra). DLP can show slight pixel-edge artifacts ("voxelisation") on curved surfaces if XY pixel density is low; industrial DLP platforms counter this with anti-aliasing, pixel-shift tiling, or very high DMD resolution. On a well-configured build, the two processes are visually indistinguishable.
Can DLP handle production volumes?
Yes — DLP is genuinely a production process, particularly for dental (millions of arch models per year), audiology (millions of hearing aid shells per year), and, via Carbon DLS variants, end-use consumer parts (adidas Futurecraft midsoles, Riddell helmet liners). For geometrically simple parts at very high volume, injection moulding still wins; for complex parts or custom-per-unit work (every aligner is different), DLP is dominant.
Is DLP the same as Carbon's DLS / CLIP technology?
Closely related but with a key addition. Carbon's Digital Light Synthesis (DLS) — originally branded CLIP (Continuous Liquid Interface Production) — is a DLP process with an oxygen-permeable membrane at the bottom of the resin vat. This creates a "dead zone" of uncured resin that allows continuous pulling of the build platform rather than layer-peel cycles. The result is no layer lines and near-isotropic mechanical properties — a different product from standard peel-cycle DLP.