Online 3D Printing Service | Digital Light Processing (DLP) 3D Printing Service

Overview

Our DLP 3D Printing Service

What is DLP

Digital Light Processing, abbreviated as DLP, appeared more than ten years after the emergence of SLA technology, which is also the second-generation light-curing molding technology recognized in the industry. DLP technology mainly uses a projector to solidify photosensitive polymer liquid layer by layer to create a rapid prototyping technology for 3D printed objects.

How Does DLP Work?

This forming technology first uses slicing software to cut the model into thin slices, and the projector plays the slideshow. Each layer of image is cured by photopolymerization in the thin area of the resin layer to form a thin layer of the part, and then the forming table moves one layer. The projector continues to play the next slide, and continues to process the next layer, and so on, until the end of printing, so not only the forming precision is high, but also the printing speed is very fast.

Features of DLP Technology

Advantages

Easy and fast

The prototype is directly made from the CAD digital model, the processing speed is fast, the product production cycle is short, and no cutting tools and molds are required.

Prototype with complex structures

It can process prototypes and molds with complex structures or shapes that are difficult to form using traditional means. Provide samples for experiments, and can verify and check the results of computer simulation calculations.

Remote control

It can be operated online and remotely controlled, which is conducive to the automation of production.

Drawbacks

Size limit

DLP is limited by the resolution of the digital light mirror, and compared with SLA, it can only print smaller products.

Available materials for DLP 3D Printing

Here is a list of our standard DLP 3D printing materials available through our online platform.

DLP 3D Printing Plastics

Resin
TDS EvoDent	UTR Flex

Custom Material

The materials available on the online system may not be exhaustive of all materials available on the market. If the materials you need are not listed on the order page, please select "custom" under the material menu, and our engineers will review and purchase.

Our standard surface finishes

Spray painting - Matt paint

Spray painting: Using spray guns with air pressure to disperse into uniform and fine droplets and apply the painting to the surface of the object.

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Spray painting - High gloss paint

Spray painting: Using spray guns with air pressure to disperse into uniform and fine droplets and apply the painting to the surface of the object.

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Vacuum plating - High gloss paint

Vacuum plating mainly includes vacuum evaporation, sputtering and ion plating.

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Vacuum plating - Matt paint

Vacuum plating mainly includes vacuum evaporation, sputtering and ion plating.

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#1000 sanding

Sanding is the use of fine abrasive sand particles to rub the surface of the product to produce a diffuse, non-linear texture effect.

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Silkscreen

Silkscreen generally refers to screen printing, which is the process of pressing ink through a stencilled mesh screen to create a printed design, graphics and text.

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Laser engraving

Laser engraving is the use of laser technology to engrave text and pattern on objects.

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Dyeing

Dyeing is done in a special solution containing dyes and particular chemical material.

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View more surface finishes

Our DLP 3D printing capability

Requirement	Specification
Max part size	300 x 230 x 130 mm
Minimum wall thickness	0.8mm
Typical surface finish	3 - 5 microns RA

Tolerances

Length(L)	Metric units
L≤100mm	±0.1mm
L>100mm	±0.1%*L

3D Printing Design Guidelines

We have summarized recommended and technically feasible values for the most common features encountered in 3D printed parts.

1. Wall thickness

The wall thickness directly determines the strength of the printed object, and also determines whether the model can be printed.
Once the model is printed, it also goes through support removal, grinding and sandblasting, which determine the minimum wall thickness for different materials. The model is printable only when the wall thickness meets the minimum requirement.

Process	5*5mm	10*10mm	50*50mm	100*100mm	200*200mm
SLA	0.5mm	0.8mm	1mm	1.2mm	1.5mm
DLP	0.5mm	0.8mm	1mm	1.2mm	1.5mm
SLS	0.8mm	1mm	1.2mm	1.5mm	2.0mm
MJF	0.8mm	1mm	1.2mm	1.5mm	2.0mm
SLM	1mm	1.2mm	1.5mm	2.0mm	2.5mm
FDM	1mm	1.2mm	1.5mm	2.0mm	2.5mm

2. Embossed and engraved detail

As the height or depth of detail is less than the minimum detail requirements, it will not be able to print accurately, can not be polished, paint and other post-processing. It is recommended that you increase the height/depth, or remove the section.

Process	Min embossed detail	Min engraved detail
SLA	0.5mm	0.5mm
DLP	0.5mm	0.5mm
SLS	0.8mm	0.8mm
MJF	0.8mm	0.8mm
SLM	1mm	1mm
FDM	1mm	1mm

3. Threads and screws

Pitch refers to the axial distance between the corresponding points of two adjacent teeth on the thread. Profile angle refers to the angle between the two sides of the whorl profile. Your design needs to meet the requirements of minimum pitch:0.6mm and minimum profile angle:20°

4. Hole diameter

The following is the minimum diameter can be achieved.

Process	Min diameter
SLA	0.8mm
DLP	0.8mm
SLS	1.5mm
MJF	1.5mm
SLM	1.5mm
FDM	1.5mm

5. Sharp surfaces

When the wall thickness is very small, models with sharp surfaces can be easily damaged during support removal, grinding, packaging, and transportation. If sharp surfaces exist, the angle should be greater than 20 degrees.

6. Clearance

Parts clearance refers to the distance between any two parts, thin wall or column, as shown above. The min clearance is 1mm. When the clearance is small, it will not be able to remove the supporting material. It is recommended that you increase the clearance size or choose other materials required by the clearance. If the independence of the two parts is not important, it is recommended that you merge them into one part.

Assembly clearance refers to the distance between any two parts to be assembled, as shown above. The min clearance is 0.2mm.

FAQ's

What is the maximum build size for your DLP 3D printing?

Our DLP 3D printing maximum build size is 300 x 230 x 130 mm (as listed on our official website), suitable for small-to-medium precision parts (dental instruments, medical devices, prototypes). For larger parts, we provide separate printing and professional assembly.

What is the minimum wall thickness requirement for DLP printed parts?

Our universal minimum printable wall thickness for DLP is 0.8mm. Micro-sized parts (around 5*5mm) can be controlled to 0.5mm with high precision; parts close to 200*200mm need wall thickness ≥1.5mm for stability.

All design files must have no broken holes. Keep main wall thickness above 1.2 mm, and ensure the thinnest feature is at least 0.8 mm. Thinner structures will bring printing failure and post-processing risks.

What are the dimensional tolerances for DLP 3D printed parts?

Our DLP printing features exceptional dimensional accuracy: for parts with length ≤100mm, the tolerance is strictly controlled at ±0.1mm; for parts with length ＞100mm, the tolerance is ±0.1% of the total length, which is suitable for high-precision assembly and functional testing requirements.

What is the typical surface finish of DLP printed parts?

The as-printed surface roughness of our DLP parts is 3–5 microns RA, presenting a smooth and delicate texture without obvious layer lines. This surface quality can directly meet most appearance display and assembly needs, and can be further optimized through post-processing such as sanding and spray painting.

What is the minimum hole diameter that DLP printing can achieve?

Our DLP printing can stably form holes with a minimum diameter of 0.8mm. The inner wall of the printed holes is smooth and free of residual resin, which can meet the requirements of standard fastener assembly and fluid flow for small holes.

What are the minimum embossed and engraved details for DLP printing?

We can achieve ultra-fine detail processing for DLP printing, with the minimum embossed detail and engraved detail both at 0.5mm. This precision can clearly restore fine patterns, small characters, logos and delicate structural features on the part surface, ensuring the integrity and clarity of details.

What are the requirements for threads and screws in DLP printing design?

The design of threads for DLP printing needs to meet the minimum pitch of 0.6mm and a minimum profile angle of 20°. Standard metric fine and coarse threads can be stably printed, ensuring smooth assembly, firm connection and durable repeated screwing use without sliding teeth.

What clearances are required for DLP printed parts?

The minimum part clearance (between two independent parts, thin walls or columns) is 1mm, which facilitates the removal of support structures and residual resin during post-processing. The standard assembly clearance is 0.2mm, which can ensure precise fitting and flexible assembly of spliced parts without jamming or excessive looseness.

What are the requirements for sharp surfaces in DLP printing design?

If the model has sharp surface structures, the included angle should be designed to be greater than 20°. Sharp angles smaller than this are prone to chipping, cracking and damage during support removal, grinding, packaging and transportation, which will affect the structural integrity and appearance of the parts.

What materials do you offer for DLP 3D printing?

Our standard DLP printing materials include TDS EvoDent (suitable for dental and medical applications) and UTR Flex (flexible resin for elastic parts). We also provide a variety of industrial-grade photopolymer resins compatible with DLP technology, such as standard resins, clear options and engineering-grade resins. Custom material options are available upon your specific request.