SLA Vs. Polyjet: Ultimate Comparison to Pick the Right One

When it comes to additive manufacturing, several 3D printing processes are available, and each method offers distinctive properties. Among many, SLA and PolyJet are commonly-used methods among industries that are robust and scalable. So, if you wonder which one to pick, we’ve got you covered.

What Is SLA & How Does It Work?

SLA, or Stereolithography, is a 3d printing technology that provides high-resolution 3d models. It uses UV lasers to cure photopolymer resin layer by layer, which is why it’s also known as a ‘UV Laminator’.

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After printing begins, the build platform gradually lowers while each successive layer of material is cured. The entire SLA process takes place inside a closed chamber to prevent exposure during the printing job. Post-processing includes removing supports and dumping excess resin in the hazardous material drum before washing the model with deionized (DI) water.

What Is PolyJet & How Does It Work?

PolyJet is another type of 3d printer that creates parts by jetting tiny droplets of liquid plastic onto a build tray. The polymers are cured with UV light after being jetted, which enables post-processing to begin. No supports or rafts are needed as the print pops off the base once it’s ready.

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It is also more cost-effective than SLA because a PolyJet machine can produce 3D printed parts with hundreds of different materials on-demand, while an SLA printer can only use one resin at a time. Also, PolyJet is ideal for prototypes and low-volume production because of its ability to change materials quickly.

SLA vs. PolyJet: Know the Differences

Both 3d printing technologies are robust to handle intricate designs and geometries. However, they are distinctive in various properties, including:

Build Style:

SLA 3D printing leverages UV lasers onto the printing bed of liquid plastics to cure patterns. On the other hand, PolyJet uses multiple printing heads to deposit liquid plastic over a platform layer by layer. PolyJet technology can deposit materials in layers with a finishing of up to 16 microns. When it comes to SLA, it prints with a finishing of 0.002″.

Post-Processing:

PolyJet and SLA printing both need support materials to ensure higher accuracy. In SLA, the support is made up of the same material as the primary object. On the other hand, PolyJet supports are made up of different materials than the object.

Material:

Parts made using both methods can withstand intense heat and light over their lifespan. Thus the materials are also ideal for outdoor conditions. SLA materials are available in grey and white opaque, rigid transparent, and other similar textures. On the other hand, PolyJet materials are available in all color options in both transparent and opaque. In addition, PolyJet is one such method that can print both rigid and flexible parts.

Surface Finish:

PolyJet offers a smoother finish that is ideal for preparing representation models and prototypes intended to be used both indoors and outdoors. On the other hand, a less shiny surface with a sand-touch finish that feels more rugged.

Pricing:

PolyJet and SLA 3d printers are almost similar in terms of their raw material costing and manufacturing cost. As both methods offer accurate design, manufacturers can pick anyone based on their requirements of surface finishing.

Versatility:

As PolyJet comes with multiple printing heads, it is more versatile than SLA. PolyJet printers can create structures with a variety of textures and strengths. This technology lets manufacturers blend rigid and soft materials to create a custom texture that is impossible in SLA.

Applications:

SLA rapid prototyping is quite popular among manufacturers for creating high-quality hollow structures. On the other hand, PolyJet technology is ideal for printing multi-color smaller parts with a comprehensive possibility of customization. PolyJet is suitable for industries like medical and aerospace, whereas SLA is suitable for dentistry, product design, jewellery, and more.

Wrapping Up!

Both additive manufacturing technologies are capable of delivering excellent results. Manufacturers need to pick the right one based on their product requirement and scale up their production. As there is no significant costing difference in both, choosing one method becomes much easier.