{"id":164152,"date":"2021-12-03T10:38:05","date_gmt":"2021-12-03T02:38:05","guid":{"rendered":"https:\/\/facfox.com\/docs\/?post_type=kb&#038;p=164152"},"modified":"2022-08-12T17:19:33","modified_gmt":"2022-08-12T09:19:33","slug":"stereolithography-sla-3d-printing-simply-explained","status":"publish","type":"kb","link":"https:\/\/facfox.com\/docs\/kb\/stereolithography-sla-3d-printing-simply-explained","title":{"rendered":"Stereolithography \/ SLA 3D Printing \u2013 Simply Explained"},"content":{"rendered":"<div class=\"listicle-header__wrapper\">\n<div class=\"listicle-header__content\">\n<h3 class=\"headline headline--xxl\">The Basics<\/h3>\n<\/div>\n<\/div>\n<div class=\"listicle-header__image\">\n<div class=\"image image--center image--rounded image--loaded\">\n<figure style=\"width: 1000px\" class=\"wp-caption aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/img.facfox.com\/imgs\/2022\/02\/dd47d52a2faf607f.png\" alt=\"\" width=\"1000\" height=\"455\" \/><figcaption class=\"wp-caption-text\">Objects printed through stereolithography. Source: Engitype.com<\/figcaption><\/figure>\n<\/div>\n<\/div>\n<p>Stereolithography \u2013 more commonly referred to as SLA 3D printing \u2013 is one of the most popular and widespread techniques in the world of additive manufacturing. It works by using a high-powered laser to harden liquid resin that is contained in a reservoir to create the desired 3D shape. In a nutshell, this process converts photosensitive liquid into 3D solid plastics in a layer-by-layer fashion using a low-power laser and photopolymerization.<\/p>\n<p>SLA is one of three primary technologies adopted in 3D printing, together with fused deposition modeling (FDM) and selective laser sintering (SLS). It belongs to the resin 3D printing category. A similar technique that is usually grouped with SLA is called digital light processing (DLP). It represents a sort of evolution of the SLA process, using a projector screen instead of a laser.<\/p>\n<h3 class=\"headline headline--xxl\">History<\/h3>\n<figure style=\"width: 1000px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" src=\"https:\/\/img.facfox.com\/imgs\/2022\/02\/c74a7d26e312c100.png\" alt=\"\" width=\"1000\" height=\"917\" \/><figcaption class=\"wp-caption-text\">A figure of the patent filed by Hull. Source: dewyseng.com<\/figcaption><\/figure>\n<p>Despite being less popular than FDM technology, SLA\u00a0is actually the oldest additive manufacturing technique.<\/p>\n<p>The technology and the term were created in 1986 by Chuck Hull, founder of 3D printing company 3D Systems. According to him, SLA is a method of creating 3D objects by\u00a0successively \u201cprinting\u201d layers, by which he meant a photosensitive material.<\/p>\n<p>In 1992,\u00a03D Systems created the world\u2019s first SLA apparatus, which made it possible to fabricate complex parts, layer by layer, in a fraction of the time it would normally take. SLA was\u00a0the first entry into the rapid prototyping field during the 1980s and has continued to advance itself into a widely used technology.<\/p>\n<div class=\"listicle-header__wrapper\">\n<div class=\"listicle-header__content\">\n<h3 class=\"headline headline--xxl\">Components<\/h3>\n<\/div>\n<\/div>\n<div class=\"listicle-header__image\">\n<div class=\"image image--center image--rounded image--loaded\">\n<figure style=\"width: 1000px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" src=\"https:\/\/img.facfox.com\/imgs\/2022\/02\/25d5e66dfaf3ddbb.png\" alt=\"\" width=\"1000\" height=\"766\" \/><figcaption class=\"wp-caption-text\">SLA components (Source: Manufactur3DMag.com)<\/figcaption><\/figure>\n<\/div>\n<\/div>\n<p>Every standard SLA 3D printer is generally composed of four primary sections:<\/p>\n<ul>\n<li>A tank filled with the liquid photopolymer: The liquid resin is usually a clear and liquid plastic.<\/li>\n<li>A perforated platform immersed in a tank: The platform\u00a0is lowered into the tank and\u00a0can move up and down according to the printing process.<\/li>\n<li>A high-powered, ultraviolet laser<\/li>\n<li>A computer interface, which manages both the platform and the laser movements<\/li>\n<\/ul>\n<h3 class=\"headline headline--xxl\">How Does It Work?<\/h3>\n<figure style=\"width: 1000px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/img.facfox.com\/imgs\/2022\/06\/01\/76aedb4788b1fb41.png\" alt=\"\" width=\"1000\" height=\"596\" \/><figcaption class=\"wp-caption-text\">Process of stereolithography. Source: http:\/\/www.thagiwara.jp\/rp-resin\/IUPAC\/iupac2000.html<\/figcaption><\/figure>\n<p><strong>Software<\/strong><\/p>\n<p>As is the case for many additive manufacturing processes,\u00a0the first step consists of designing a\u00a03D model through CAD software. The resulting CAD files are digitalized representations of the desired object.<\/p>\n<p>If they are not automatically generated as such, the CAD files must be converted into STL files.\u00a0Standard tessellation language (STL), or \u201cstandard triangle language\u201d, is a file format\u00a0native\u00a0to the stereolithographic software created by the Abert Consulting Group specifically for 3D Systems back in 1987.\u00a0STL files describe the surface geometry of the\u00a03D object, neglecting other\u00a0common CAD model attributes, such as color and texture.<\/p>\n<p>The pre-printer step is to feed an STL file into a 3D slicer software, such as Cura. Such platforms are responsible for generating G-code, the native language of 3D printers.<\/p>\n<p><strong>SLA 3D Printing<\/strong><\/p>\n<p>When the process starts, the laser \u201cdraws\u201d\u00a0the first layer of the print into the\u00a0photosensitive resin. Wherever the laser hits, the liquid solidifies. The laser is directed to the appropriate coordinates by a computer-controlled mirror.<\/p>\n<p>At this point, it\u2019s worth mentioning that most desktop SLA printers work upside-down. That is, the laser is pointed up to the build platform, which starts\u00a0low and is incrementally raised.<\/p>\n<p>After the first layer, the platform is raised according to the layer thickness\u00a0(typically about 0.1 mm) and the additional resin is allowed to flow below the already-printed portion. The laser then solidifies the next cross-section, and the process is repeated until the whole part is complete.\u00a0The resin that is\u00a0not touched by the laser remains in the vat and can be reused.<\/p>\n<p><strong>Post-Processing<\/strong><\/p>\n<p>After finishing the material polymerization, the platform rises out of the\u00a0tank\u00a0and the excess resin is drained. At the end of the process, the model is removed from the platform, washed of excess resin, and then placed in a UV oven for final curing. Post-print curing enables objects to reach the highest possible strength and become more stable.<\/p>\n<p><strong>Alternative Process: Digital Light Processing<\/strong><\/p>\n<p>As we mentioned before, one descendant of SLA is\u00a0digital light processing (DLP). Unlike\u00a0SLA, DLP uses a digital projector screen to flash a single image of each layer across the entire platform. As the\u00a0projector is a digital screen, each layer will be composed of square pixels. Thus, the resolution of a DLP printer corresponds to pixel size, whereas with SLA, it\u2019s the laser spot size.<\/p>\n<h3 class=\"headline headline--xxl\">Pros &amp; Cons<\/h3>\n<figure style=\"width: 1000px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/img.facfox.com\/imgs\/2022\/02\/06c896f612b68d94.png\" alt=\"\" width=\"1000\" height=\"478\" \/><figcaption class=\"wp-caption-text\">A balance between advantages and disadvantages. Source: http:\/\/entreprenoria.com\/startups\/home-based-business\/the-pros-and-cons-of-starting-a-home-business\/<\/figcaption><\/figure>\n<p><strong>Pros<\/strong><\/p>\n<ul>\n<li>SLA is one of the most precise 3D printing techniques on the market.<\/li>\n<li>Prototypes can be created with extremely high quality, with finely detailed features (thin walls, sharp corners, etc\u2026) and complex geometrical shapes. Layer thicknesses can be made as low as 25 \u03bcm, with minimum feature sizes between 50 and 250\u00a0\u03bcm.<\/li>\n<li>SLA provides the tightest dimensional tolerances of any rapid prototyping or additive manufacturing technology: +\/- 0.005\u2033 (0.127 mm) for the first inch, and an additional 0.002\u2033 for each additional inch.<\/li>\n<li>Print surfaces are smooth.<\/li>\n<li>Build volumes can be as high as 50 x 50 x 60 cm\u00b3 without sacrificing precision.<\/li>\n<\/ul>\n<p><strong>Cons<\/strong><\/p>\n<ul>\n<li>Printing tends to take a long time.<\/li>\n<li>Steep slopes and overhangs require support structures during the building process. Such parts may potentially collapse during printing\u00a0or curing phases.<\/li>\n<li>Resins are comparatively fragile and therefore not suitable for functional prototypes or mechanical testing.<\/li>\n<li>SLA offers limited material and color choice, usually offering black, white, grey and clear material. Resins are oftentimes proprietary and therefore cannot be easily exchanged between printers from different brands.<\/li>\n<li>SLA printing costs are comparatively high\u00a0(e.g. machine, materials, lab environment).<\/li>\n<\/ul>\n<h3 class=\"headline headline--xxl\">SLA vs. FDM<\/h3>\n<figure style=\"width: 1000px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/img.facfox.com\/imgs\/2022\/02\/e7b87b2eb5f78b37.png\" alt=\"\" width=\"1000\" height=\"563\" \/><figcaption class=\"wp-caption-text\">Choose wisely&#8230; Source: XYZPrinting.com<\/figcaption><\/figure>\n<p>In FDM, filament is fed through a hot extruder and deposited layer-by-layer. The materials used are typically thermoplastics, but they can be mixed with other elements, including wood, metal, and carbon fiber. This is one advantage over SLA, which has only a limited choice of materials.<\/p>\n<p>Whereas in FDM resolution refers to the precision of the motors, in SLA it depends on the tightness of the laser beam. This is why SLA is capable of producing objects of higher detail and accuracy.<\/p>\n<p>An object printed using an FDM 3D printer is post-processed by removing supports (if present) and smoothening surfaces. In SLA, prints are submerged in isopropyl alcohol to remove excess resin before being subjected to passive UV light for extra strengthening. Nevertheless, the final result is in general not as strong as a product of FDM.<\/p>\n<p>The cost of materials is decisively lower for FDM, since the printers are more affordable, and plastic reels are cheaper than resin.<\/p>\n<p>In a nutshell, if high precision and a smooth finish are priorities, SLA will be your best bet. If cost and (to a lesser extent) durability play a role, use an FDM printer. For a more in-depth comparison, take a look at our article.<\/p>\n<h3 class=\"headline headline--xxl\">SLA vs. SLS<\/h3>\n<figure style=\"width: 1000px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/img.facfox.com\/imgs\/2022\/02\/6337dad3b3f22aee.png\" alt=\"\" width=\"1000\" height=\"500\" \/><figcaption class=\"wp-caption-text\">No more supports. Source: waykenrm.com<\/figcaption><\/figure>\n<p>Selective laser sintering (SLS) involves an entirely\u00a0different approach, although it also involves the use of a laser<\/p>\n<p>Although it also uses a laser, it\u2019s much more powerful. That\u2019s because, instead of curing a substance, the beam heats a powder to the point of fusing its particles together. Often grouped with SLS are direct metal laser sintering (DMLS) and selective laser melting (SLM), which are specifically adapted to metals. Normal SLS works with polymers like nylon.<\/p>\n<p>Compared to objects made with other technologies, SLS prints are especially strong and durable. Also, because supports aren\u2019t necessary in SLS, prints can be of complex geometries. Detailing can be fairly high with SLS, it generally can\u2019t compare to the precision of SLA.<\/p>\n<p>Because of their highly powered lasers, SLS machines incorporate more advanced technology, including special shielding against harmful UV radiation. This results in printers that are more expensive, with few desktop or benchtop options available.<\/p>\n<p>Furthermore, SLS powders are more expensive than liquid photopolymers.<\/p>\n<p>In a nutshell, if high mechanical strength and complex shapes are your priority, and the cost is of minor importance, use an SLS printer. Otherwise, SLA is probably your best bet. For a more in-depth comparison, check out our article\u00a0<a class=\"link crosslink\" href=\"https:\/\/facfox.com\/docs\/kb\/stereolithography-sla-3d-printing-simply-explained\">SLA vs SLS: The Differences \u2013 Simply Explained<\/a>.<\/p>\n<h3 class=\"headline headline--xxl\">Final Remarks<\/h3>\n<figure style=\"width: 723px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/img.facfox.com\/imgs\/2022\/02\/1b57a34bf63aeecb.png\" alt=\"\" width=\"723\" height=\"500\" \/><figcaption class=\"wp-caption-text\">An example of a fractal tree, a complex geometry printable using stereolithography. Source: sicam.com<\/figcaption><\/figure>\n<p>Although stereolithography is the first process developed for rapid prototyping, and the oldest among the main 3D printing methods, it still remains an attractive solution for creating prototypes with high accuracy and durability. Many industries and hobbyists use this process to build prototypes as well as final products, and the technology continues to become more affordable and accessible.<\/p>\n<p>&nbsp;<\/p>\n<p>Source: <a href=\"https:\/\/all3dp.com\/2\/stereolithography-3d-printing-simply-explained\/\">https:\/\/all3dp.com\/2\/stereolithography-3d-printing-simply-explained\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Basics Stereolithography \u2013 more commonly referred to as SLA 3D printing \u2013 is one of the most popular and widespread techniques in the world of additive manufacturing. It works by using a high-powered laser to harden liquid resin that is contained in a reservoir to create the desired 3D shape. In a nutshell, this [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"kbtopic":[45],"kbtag":[126,140,125,89,403],"class_list":["post-164152","kb","type-kb","status-publish","hentry","kbtopic-tech","kbtag-3d-printing","kbtag-principle","kbtag-resin","kbtag-sla","kbtag-technology"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.1 (Yoast SEO v27.1.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Stereolithography \/ SLA 3D Printing \u2013 Simply Explained - FacFox Docs<\/title>\n<meta name=\"description\" content=\"The Basics Stereolithography \u2013 more commonly referred to as SLA 3D printing \u2013 is one of the most popular and widespread techniques in the world of What is stereolithography? How does it work? Where does the name come from? 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How does it work? Where does the name come from? We cover it all in this guide to SLA 3D printing.","breadcrumb":{"@id":"https:\/\/facfox.com\/docs\/kb\/stereolithography-sla-3d-printing-simply-explained#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/facfox.com\/docs\/kb\/stereolithography-sla-3d-printing-simply-explained"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/facfox.com\/docs\/kb\/stereolithography-sla-3d-printing-simply-explained#primaryimage","url":"https:\/\/img.facfox.com\/imgs\/2022\/02\/dd47d52a2faf607f.png","contentUrl":"https:\/\/img.facfox.com\/imgs\/2022\/02\/dd47d52a2faf607f.png"},{"@type":"BreadcrumbList","@id":"https:\/\/facfox.com\/docs\/kb\/stereolithography-sla-3d-printing-simply-explained#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/facfox.com\/docs\/"},{"@type":"ListItem","position":2,"name":"Stereolithography \/ SLA 3D Printing \u2013 Simply Explained"}]},{"@type":"WebSite","@id":"https:\/\/facfox.com\/docs\/#website","url":"https:\/\/facfox.com\/docs\/","name":"FacFox Docs","description":"Knowledgebase of manufacturing","publisher":{"@id":"https:\/\/facfox.com\/docs\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/facfox.com\/docs\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/facfox.com\/docs\/#organization","name":"FACFOX,INC.","url":"https:\/\/facfox.com\/docs\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/facfox.com\/docs\/#\/schema\/logo\/image\/","url":"https:\/\/facfox.com\/docs\/wp-content\/uploads\/2020\/11\/foxdoc-favicon.png","contentUrl":"https:\/\/facfox.com\/docs\/wp-content\/uploads\/2020\/11\/foxdoc-favicon.png","width":132,"height":133,"caption":"FACFOX,INC."},"image":{"@id":"https:\/\/facfox.com\/docs\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/facebook.com\/facfox3d","https:\/\/x.com\/facfox3d","https:\/\/instagram.com\/facfox3d"]}]}},"_links":{"self":[{"href":"https:\/\/facfox.com\/docs\/wp-json\/wp\/v2\/kb\/164152","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/facfox.com\/docs\/wp-json\/wp\/v2\/kb"}],"about":[{"href":"https:\/\/facfox.com\/docs\/wp-json\/wp\/v2\/types\/kb"}],"author":[{"embeddable":true,"href":"https:\/\/facfox.com\/docs\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/facfox.com\/docs\/wp-json\/wp\/v2\/comments?post=164152"}],"version-history":[{"count":4,"href":"https:\/\/facfox.com\/docs\/wp-json\/wp\/v2\/kb\/164152\/revisions"}],"predecessor-version":[{"id":165591,"href":"https:\/\/facfox.com\/docs\/wp-json\/wp\/v2\/kb\/164152\/revisions\/165591"}],"wp:attachment":[{"href":"https:\/\/facfox.com\/docs\/wp-json\/wp\/v2\/media?parent=164152"}],"wp:term":[{"taxonomy":"kbtopic","embeddable":true,"href":"https:\/\/facfox.com\/docs\/wp-json\/wp\/v2\/kbtopic?post=164152"},{"taxonomy":"kbtag","embeddable":true,"href":"https:\/\/facfox.com\/docs\/wp-json\/wp\/v2\/kbtag?post=164152"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}