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Comparison of 3D printing technology: SLA and DLP!

    Currently on the market for desktop light curing 3D printers fall into two broad categories: Desktop SLAs and Desktop DLP . Also belong to the light-cured printer, so what is the specific difference between the two printers and how does it perform?

    Stereolithography ( SLAs ) and Digital Light Processing ( DLP ) 3D printing technology follows a very similar principle, but can print out significantly different finished products. Understanding The nuances of each 3D printing process can help break users ' expectations of errors in the final print results and how to effectively maximize the potential of each different machine.

    "Stereolithography" from Greek "Stereo" , meaning an entity, " ( Photo ) Lithography " , it is a way of lithography. In 3D printing,stereolithography refers to using light to draw an entity. SLA technology solidifies the liquid resin through a specific energy source, curing each layer at a time, and the stack is molded.

    By definition, SLAs and DLP It 's all part of it . stereolithography technology, but draw layers with laser light (SLA) and projection drawing layers (DLP) will be completely different. Let's take a closer look at exactly what's different.

Laser light. SLAs and DLP

    According to the mirror industry terminology, we are here to refer to laser beam based technology as "SLA" . For SLAs and DLP, liquid photosensitive resins form a very thin solid surface through illumination, and then stack to form a complete object.

Stereolithography structural principle

Stereolithography structural principle


    SLAs using two motors, called a current meter or a vibrating mirror (one in the X axis, one in the Y on the shaft), quickly aim the laser beam at the printing area so that the resin solidifies and takes shape. The same technique, you should first slice your 3D diagram into a series of points and lines as a coordinate path for the vibrating mirror to reflect the laser light.

    DLP use a digital projection screen to irradiate a single image on each layer of the print platform. Because the projection image is a digital screen, the image of each layer consists of square pixels, resulting in each layer being formed by a small rectangular block called a pixel.

DLP principle

DLP principle

    The fact that the basic units of the two light curing methods have different shapes makes it difficult to compare two different machines by value and specification alone.

SLAs , DLP The Molding dimensions VS Print Speed

    DLP faster printing time can be achieved when printing certain objects, because each time you take a picture is a layer, so the speed is relatively fast. Instead of being irradiated with a laser light point like an SLA, light needs to bypass all paths.

    But DLP the speed is only in two situations, for large, high fill rate objects, each layer in the projection formula will be faster than the laser light point to print the way. For very small, precise and detailed objects, the molding range can be replaced with smaller projection lenses, and more detailed points of light are used to maintain good detail performance.

    Although faster, it uses DLP When a technology prints multiple objects at the same time, it can affect the resolution or surface integrity of the object.

3D printed's wax model

3D printed's wax model


    DLP 3D the printer is not suitable for printing high-resolution parts full of boards. For example, a DLP printer can print a well-crafted ring and be faster than an SLA printer. However, if you want to print many fine rings at once, you will need an SLA 3D printer to maintain a consistent high resolution throughout the print area.

    DLP The resolution of the print depends on the projector, and the projector determines the pixels that can be reached. For example,fullHD 1080p.

    DLP 3D the projector in the printer must focus on the image size to achieve the given X-y resolution. When small pixels are required, limit the entire print area by narrowing the entire image. That is, Precision Printing on a DLP printer can only use a fraction of the entire print area, while large models can only be printed at low resolution.

    Laser SLAs the printer's print range is completely independent of the resolution of the printed object. A single object print can be any size and any resolution anywhere in the print area.

Surface treatment: pixels and layer sense

    Because in 3D the objects in print consist of layers of stacks, so 3D printing usually has a visible horizontal sense of layer. However, because DLP uses rectangular pixels to render images, there is still a vertical sense of the base.

Note these lines in the photo below. a vertical base feel can be found on the surface of the DLP printout.

Pixels different form SLA and DLP

Pixels different form SLA and DLP

    DLP 3D The printer uses rectangular pixels to render the image, which results in a vertical base sensation. In this image, the vertical base sense is seen to appear naturally on the left, and then the outline is easier to identify on the right.

    Because the unit is rectangular, pixels also have an effect on the curved edges. Think of building a round-edge with Lego bricks - edges will appear on the Z - axis and X-y planes in a ladder shape.

 Voxel effect voxel side profile

 Voxel effect voxel side profile

    The rectangular shape of the pixel allows the curved edges to appear in a step shape.After analyzing the differences between technology and results, choose the best fit for your workflow and printing needs 3D Printing solutions will become easier. In this case, it is important to understand the surface smoothness required for final printing, as well as the size and complexity of the object.

    Here's what types of objects are better suited DLP and SLAs Some of the general guidelines:

    The above is the content of this issue! You watchman have any different suggestions and views, welcome to the bottom of the message or private text, small series will be sorted in the words, I hope to help more readers!Thank you all for taking watch!

Date : 2019-03-11

In : Jewelry Knowlege

Published By : Jewellery Factory


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