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3D Printing Technology Comparison:

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Filament vs resin 3D printing

SLA and FDM are two of the most popular 3D printing technologies used today. Each of which offers its own set of advantages and disadvantages. SLA (stereolithography) is an additive manufacturing method that uses liquid resin to build up layers of material, while FDM (fused deposition modeling) uses plastic filaments that are heated and extruded onto a build platform layer by layer. In this article, we breakdown the main differences between these two fantastic technologies and explore which could be a better fit for your project.



FDM vs SLA 3D printing: which is better?


Resolution & Print Quality

SLA 3D printing is known for its fine features, smooth surface finish, and pin point precision. While FDM printers form layers by depositing molten filaments, SLA printers cure liquid resin by the use of a tiny and highly-precise laser to form each layer. As a result, it can achieve much finer and intricate details than from extruding filament through a nozzle.


Print Speed

Both SLA and FDM offer excellent speed. Due to the small surface area of the laser, SLA takes longer to build each layer. With FDM you can choose the layer heights, which allows for much faster 3D printing. But beware, there is a trade-off between print speed and print quality. If you want a quick prototype with no strict visual or resolution requirement, FDM is the preferred choice.



In terms of material options, SLA and FDM offer the most flexibility when it comes to plastic 3D printing. Generally, the physical properties such as strength, flexibility and durability of FDM materials are superior to SLA. However, if you’re looking for materials to produce clear or transparent prototypes, opt for SLA.


a comparison between sla (stereolithography) and fdm 3d printing



Industrial FDM and SLA printers can handle very large builds (up to 750 x 750 x 750mm and 800 x 800 x 550mm respectively). While FDM may be quicker, generally, industrial SLA printers are preferred for printing large parts like enclosures and models, as it can maintain excellent detail and surface smoothness.



Although you can expect the cost of SLA and FDM 3D printing to be more or less similar, SLA typically have a higher average cost. This is largely due to the longer print time and higher material costs.


Applications & Industries

While SLA and FDM are both mature processes widely used for rapid prototyping and small-scale production, both additive manufacturing technologies have their own technique and advantage that make them better suited for certain applications.


  • Watertight and airtight products — Unlike FDM parts, SLA parts have no gaps between layers and negligible directional weaknesses. SLA printed parts can therefore be used in waterproof and airtight applications.
  • Functional applications — SLA materials generally lack overall strength and functionality compared to FDM. As such, FDM is a better option for parts like brackets and jigs and fixtures.
  • Consumer products — As speed to market and aesthetics are highly valued to consumer product manufacturers, SLA is often favoured to make these products.
  • Automotive and aerospace applications — The strict requirements for functionality in these industries limit SLA 3D printing. Therefore, FDM 3D printing tend to be more commonly used in these applications.
  • Jewellery and dental applications — Stereolithography is more often used in such applications as print quality and accurate detailing are highly valued in these industries.


Summary of differences between FDM and SLA


Industrial FDMIndustrial SLA
Surface Finish★★☆☆★★★★
Part Strength★★★☆★☆☆☆
Material Cost★★★★★★★☆
SpeedOffers excellent convenience and speed for parts with no strict quality or surface finish requirementsOffers excellent speed for high accuracy and fine detailed parts and prototypes
ResolutionNot ideal for fine detailed partsOffers excellent resolution
ApplicationsLow-cost rapid prototyping
Functional rapid prototyping
Automotive applications
High strength prototypes
Prototyping in materials like PETG.
Low-cost rapid prototyping
High resolution and fine details models
Watertight and airtight prototypes
Transparent prototypes
Highly accurate to CAD parts
Print VolumeUp to 750 x 750 x 750 mmUp to 800 x 800 x 550 mm
MaterialsWide range of high performance material including Nylon, ABS, ASA, PETG, etc.Variety of resins including generic, rigid, high temp, high toughness and transparent resin options.

MJF 3D Printing 2

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FDM vs SLA: which one is the better fit for you?

What is your design intent? Which factors are most important to your project? Is it print quality, speed, cost, material, size or application? The table above should help you get started when comparing the two technologies; however, every project is treated on a case-by-case basis. If you’re having trouble picking between FDM and SLA, send us your 3D CAD file HERE, and our engineers will get back to you with advice.

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