--- title: 4 important aspects that help understand Stereolithography (SLA) better description: SLA is a 3D printing technology used for creating smooth parts with fine details and high level of accuracy. 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The first 3D printing patented application was file by Chuck Hill in 1984. SLA or Stereolithography is one of the [commonly used 3D printing technologies](https://www.cmac.com.au/blog/top-10-popular-3d-printing-technology). It allows engineers and designers to produce 3D plastic parts with high accuracy and high resolution, fine details and smooth surface finish. To learn more about this 3D printing technology, here are 4 vital aspects that help understand SLA(Stereolithography) better.  ## **What is SLA (Stereolithography)** SLA uses a laser to cure photopolymer resin layer by layer. In this method, the laser or light solidifies liquid resin through a process called [photopolymerization](https://computer.howstuffworks.com/3-d-printing3.htm). SLA 3D printers use liquid printing material and UV protection cover. SLA printers usually offer a relatively small volume of production compared to other 3D printing technologies. However, there are other SLA 3D printers that can produce larger parts. A standard SLA 3D printer is composed of 4 primary sections: 1. A tank filled with liquid photopolymer or liquid resin which is usually clear liquid plastic 2. A perforated platform that is immersed in a tank and can be moved up and down according to the printing process 3. High-powered ultraviolet laser 4. A computer interface that manages the platform and laser movements ## **Benefits and limitations of SLA** One of the [advantages](https://www.3d-stereolithography.com/advantages-and-disadvantages/) of using SLA is that it can produce very high dimensional and accurate 3D parts. It can also produce parts that have very smooth surface finish which is ideal for visual prototypes. On the other hand, parts that are printed with SLA can be brittle and may not be suitable for functional prototypes. 3D parts that are produced via SLA tend to curl or warp. Moreover, its mechanical properties and visual appearance may degrade over time especially when exposed to sunlight. ## **SLA 3D printing workflow** SLA has two main types: laser-based (or simply SLA) and projection-based (DLP or Digital Light Projection). Both have an similar procedure but uses different light sources. SLA uses a laser while DLP uses a projector. To understand it better, this is how SLA 3D printing works: 1. The build platform is positioned in a tank of liquid photopolymer. It should have a distance of one layer height for the surface of the liquid. 2. To start, the UV laser creates each layer by selectively curing and solidifying photopolymer resin. 3. When a layer is finished, the platform will move at a safe distance and a sweeper blade recoats the surface. This process is repeated until the part is completely finished. 4. After printing, the 3D part may require further [post-processing procedure](https://www.cmac.com.au/blog/4-vital-things-post-processing-3d-printed-parts). ## **Overview of SLA materials** SLA can produce 3D parts from thermoset polymers or resins through the process of photopolymerization. Here is an overview of the [common SLA materials](https://www.3dhubs.com/knowledge-base/how-design-parts-sla-3d-printing#sla-materials). - **Standard resin** Standard resins have high tensile strength but are known to be very brittle. This means that it is not suitable to use for functional parts. Since it has the ability to create fine features, it is also ideal for making visual prototypes and art models. - **Clear resin** Clear resins are basically transparent material that is used for SLA 3D printing. It has similar mechanical properties to standard resin and can be post-processed to near optical transparency. Clear resins are often used for showcasing internal features, LEDs housing and fluidic devices. - **Castable resin** This type of resin is ideal for making jewellery and other small and intricate components. This material enables parts to be printed with sharp details and smooth finish. It will also burn out easily and will not leave any ashes or residue. - **Tough or durable resin** It is called durable resin as it has the highest impact strength and elongation at break among other SLA materials. It is usually used for prototyping parts with moving elements and snap-fits. - **Heat-resistant resin** This resin is ideal for application that requires high thermal stability. This material has a heat deflection temperature between 200-300ᵒC. It is typically used for manufacturing heat-resistant fixtures, hot air and fluid flow equipment, casting and thermoforming tooling and mould prototypes. - **Dental resin** Dental long term Biocompatible resin (Class IIa biocompatible) is a special type of resin that is designed for long term orthodontic purposes. This resin can be in contact with human body for as long as one year. ## **Conclusion** SLA is best suited for engineers and designers who need to produce small, smooth parts with fine details and high level of accuracy. In this blog post, you have learned about how SLA 3D printing works, advantages and limitations, common SLA materials and other aspects in SLA 3D printing.   For those who are interested in SLA 3D printing, you can ask for professionals or [approach a 3D printing service provider](https://www.cmac.com.au/3d-design-printing/3d-printing-sydney). They can give you advices regarding SLA 3D printing and provide services related to 3D printing. 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His comment on the first day of using "Low Loader trailer":nursery-equipment/7-trailers/#low-loader-self-tracking-trailer “Can now move 100 litre pots with trees, 150 metres in 1 hr and not get a sore back”. \*\[Purchasing Officer\]\* A mining design and machining company needed help with machining components urgently as they were too busy to keep up with the demand. C-Mac machined the components so the deadline could be met. \*\[General Manager\]\* Customer had to submit a proposal and compete against other countries for the manufacturing facility. C-Mac submitted drawings to show there was space in existing plant to install the new process and to comply with all Australian OH&S Standards. Working together with customer to submit proposal to the Head Office overseas WON the contract. Project was a success meeting 6month lead time and budget. \*\[Nursery Owner\]\* Needed a specific Potting & Mixing machine. for his yuccas nursery, but the problem was it was no longer manufactured. From his description and specifications our engineers designed and modelled in 3D software his requirements. "Potting Machine":nursery-equipment/3-potting-machines/ was manufactured and fully tested with potting media in our workshop, video was then sent to customer who was very pleased with the results. Machine disassembled and freighted interstate and installed. \*\[Maintenance Engineer\]\* An industrial hydraulic fitting manufacturer had problems with gear and shaft breakages with their machinery. They also had problems repairing and maintaining. C-Mac offered to repair and maintain their machinery on-site instead of having to permanently employ fitters. ## Information - [About](https://www.cmac.com.au/about-us/our-history) - [Careers](https://www.cmac.com.au/employment) - [Blog](https://www.cmac.com.au/blog) - [Contact Us](https://www.cmac.com.au/contact) ## [Locate Us](https://www.cmac.com.au/contact) 21/64 Drummond St South Windsor NSW 2756 Phone: (02) 9631 6000 ![](https://www.cmac.com.au/hs-fs/hubfs/images/infocmac.com.au.jpg?width=170&name=infocmac.com.au.jpg) Copyright 1966-2022 @ C-Mac Industries Pty Ltd [![Connect with us on LinkedIn](https://www.cmac.com.au/hs-fs/file-357023590-png/images/linkedin.png "Connect with us on LinkedIn")](https://www.linkedin.com/company/c-mac-industries-aust-pty-ltd) [![twitter_icon](https://www.cmac.com.au/hs-fs/hub/320163/file-2404272988-png/images/twitter_icon.png?width=28&height=28&name=twitter_icon.png)](https://twitter.com/CM_NurseryEquip) [![Google_plus_icon](https://www.cmac.com.au/hs-fs/hub/320163/file-2406624891-png/images/Google_plus_icon.png?width=28&height=28&name=Google_plus_icon.png)](https://plus.google.com/112714079408736501768) [![Youtube_icon](https://www.cmac.com.au/hs-fs/hub/320163/file-2410967582-png/images/Youtube_icon.png?width=28&height=28&name=Youtube_icon.png)](https://www.youtube.com/user/CMacIndustries/videos) [![Follow us on Facebook](https://www.cmac.com.au/hs-fs/file-355333581-png/images/facebook.png?width=28&height=28&name=facebook.png "Follow us on Facebook")](http://www.facebook.com/pages/C-Mac-Industries/229124343802420)