{"id":3613,"date":"2026-10-26T14:56:04","date_gmt":"2026-10-26T06:56:04","guid":{"rendered":"http:\/\/www.epitexespana.com\/blog\/?p=3613"},"modified":"2026-10-26T14:56:04","modified_gmt":"2026-10-26T06:56:04","slug":"what-is-the-resolution-of-sls-printing-46f6-4cccd7","status":"publish","type":"post","link":"http:\/\/www.epitexespana.com\/blog\/2026\/10\/26\/what-is-the-resolution-of-sls-printing-46f6-4cccd7\/","title":{"rendered":"What is the resolution of SLS Printing?"},"content":{"rendered":"

If you\u2019ve ever dabbled in additive manufacturing, you\u2019ve probably heard someone throw around \u201cSLS printing\u201d like it\u2019s some magic fix for every part-making problem. But let\u2019s be real\u2014when a client first reaches out, 9 times out of 10, their first question (after \u201ccan you print my part?\u201d) is \u201cwhat\u2019s the resolution?\u201d And it\u2019s not a dumb question. Resolution is make-or-break for things like fit, finish, or even how a part performs. As an SLS provider who\u2019s been in the game long enough to answer more of these questions than I can count, I\u2019m here to break it down without the jargon, no fancy textbook stuff\u2014just straight talk that actually makes sense. SLS Printing<\/a><\/p>\n

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First off, let\u2019s clear up a common myth: \u201cresolution\u201d in SLS isn\u2019t a single number you can pull off a spec sheet and call it a day. Unlike, say, a 3D printer that uses an FDM nozzle where people fixate on .2mm or .4mm, SLS resolution is a combo of three different things that work together, not against each other. Let\u2019s name \u2019em: layer thickness, hatch spacing, and beam spot size. Yeah, I know, three terms to keep track of\u2014but stick with me, I\u2019ll make it simple.<\/p>\n

Layer thickness is the easy one. That\u2019s how thin each layer of polymer powder gets spread before the laser zaps it to fuse into shape. Most SLS systems we run as a supplier do either .1mm (100 microns) or .15mm (150 microns) layers. Wait, \u201cmicrons\u201d? Yeah, that\u2019s just a fancy word for a millionth of a meter\u2014so 100 microns is about as thick as a human hair, give or take. A lot of people think thinner = better resolution, and for FDM that\u2019s true, but SLS is different. If you run .1mm layers, you\u2019ll get a smoother side on your part, no weird \u201cstep\u201d lines (that stair-stepping thing you see on cheap FDM parts). But here\u2019s the catch: thinner layers mean the print takes longer, and your machine\u2019s throughput drops. So if you\u2019re printing a 100 small identical parts, .15mm layers might be perfect\u2014faster, cheaper, and the resolution will be good enough. But if you\u2019re making a part with tiny features, like a latch that has to slide into a slot no bigger than 1mm, that\u2019s when .1mm layers matter.<\/p>\n

Next up is hatch spacing. No, that\u2019s not a type of hat (sorry, I had to throw that in). Hatch spacing is how far apart each pass of the laser is when it traces the shape of your part. Think of it like drawing with a pen: if you draw lines 1mm apart, the gaps between them are 1mm. If you draw lines .25mm apart, the gaps are way smaller. For SLS, standard hatch spacing is usually between .1mm and .3mm. The tighter the spacing, the denser the part, and the sharper the edges. But again, trade-off: too tight, and the laser might not have enough space to move, leading to over-fusing where the laser melts into the surrounding powder where you don\u2019t want it. That\u2019s how you get blobby edges or a part that\u2019s bigger than your design. I\u2019ve had clients come back with parts they printed elsewhere that had a 2mm overhang turn into a 2.5mm blob because their provider cranked the hatch spacing too tight. Avoid that, always.<\/p>\n

Then there\u2019s beam spot size, which is the most important one for tiny details. The beam spot is the width of the laser itself when it hits the powder. A lot of people act like beam spot size is the holy grail, and technically it is\u2014but only if you pair it right. Most entry-level SLS machines have a 0.4mm beam, while the industrial ones we use (the good stuff) have a 0.2mm or even 0.15mm beam. A 0.15mm beam means you can trace really tiny features\u2014like a 0.3mm diameter hole, or a 0.2mm thin wall\u2014without the laser spilling over into the rest of the powder. But here\u2019s the thing: a smaller beam is slower. If you\u2019re running a 0.15mm beam, the laser can\u2019t cover as much area per second as a 0.4mm beam. So again, trade-off. I always tell clients: if you\u2019re printing a big structural part that doesn\u2019t have tiny features, the 0.4mm beam is fine, and you\u2019ll save 30% on your print time. If you need that micro-latch or a part that fits into a medical device, spring for the smaller beam. It\u2019s worth it.<\/p>\n

Now, let\u2019s tie this to real parts, because specs don\u2019t mean jack if they don\u2019t match what you\u2019re making. Let\u2019s say you\u2019re a small business owner making custom drone brackets. Those parts don\u2019t have tiny details\u2014they\u2019re big, structural, need to hold up to vibration. So for you, resolution here would be around .15mm layer thickness, .25mm hatch spacing, and a 0.4mm beam. That\u2019ll give you a part that\u2019s smooth enough, strong enough, and fast to print. No wasted money on extra resolution you don\u2019t need.<\/p>\n

But if you\u2019re a aerospace engineer making a small fuel line fitting, that\u2019s a different story. That part needs a 0.5mm internal hole that has to seal perfectly, and walls that are no thicker than 0.3mm. Here, you\u2019d go with .1mm layers, .15mm hatch spacing, and a 0.15mm beam. That\u2019s the resolution you need to get that hole right, no leaks, no blobs. I\u2019ve worked with aerospace clients for years, and this is the sweet spot for their parts. They don\u2019t cut corners because a bad fuel line fitting isn\u2019t just a bad part\u2014it\u2019s a safety risk.<\/p>\n

Now, let\u2019s talk about the things that mess with resolution that aren\u2019t just machine specs. Because here\u2019s the secret: even the best machine in the world can spit out a bad part if you don\u2019t prep the powder or cool it right. SLS uses nylon powder (mostly, some other polymers now) and when the laser fuses it, the surrounding powder has to stay cool enough so it doesn\u2019t fuse by accident. If the temp inside the build chamber is off, you get \u201cfuzzy edges\u201d\u2014that\u2019s when the part\u2019s outer layer is a little rough, not sharp, because stray laser energy melted extra powder. I\u2019ve seen this happen at other providers all the time\u2014they cut corners on chamber temp to print faster, and their parts look like sandcastles. We run our chamber temp to within 1 degree of the glass transition temperature of the powder, and that\u2019s why our parts have clean, sharp edges. That\u2019s a big part of resolution no one talks about.<\/p>\n

Another thing: powder reuse. If you\u2019re using fresh powder every time, you get better resolution, obviously. But powder is expensive, so most providers mix fresh powder with old powder from previous builds. We do a 50\/50 mix, but if you go more than that, the old powder starts to break down, get coarser, and that makes your part\u2019s surface rougher, edges blunter. I\u2019ve had clients who tried to get a part printed at a place that used 80\/20 old powder, and their 1mm feature turned into a 1.2mm blob. That\u2019s not a resolution issue from the machine\u2014that\u2019s a powder mix issue. So don\u2019t just look at the machine specs; ask your provider how they prep their powder.<\/p>\n

Wait, let\u2019s also clear up another confusion: resolution vs. surface finish. A lot of people mix these up. Surface finish is how rough the part is\u2014measured in Ra, like Ra 3.2 or Ra 1.6. Resolution is about how sharp and accurate the features are, how close the part is to your CAD design. You can have good resolution (sharp edges, accurate holes) but a rough surface, and vice versa. For example, if you print a part with a 0.1mm beam but use .15mm layers, it\u2019ll have slightly more step lines, so higher Ra, but the features are still accurate. That\u2019s a key difference.<\/p>\n

So what\u2019s the takeaway here? When someone asks \u201cwhat\u2019s the resolution of SLS printing?\u201d there\u2019s no one-size-fits-all answer. It depends on your part, your needs, and what you\u2019re willing to pay. If you need super tiny features, go for the small beam and thin layers. If you just need a structural part, you can save money with bigger layers and a wider beam. And always, always ask your provider about their chamber temp and powder mix\u2014those are the behind-the-scenes things that actually make the resolution work, not just the spec sheet numbers.<\/p>\n

As someone who\u2019s been doing SLS printing for years, I\u2019ve seen clients waste so much money going for \u201cmax resolution\u201d when they didn\u2019t need it, or too little resolution and their part failed. My job as a provider isn\u2019t just to print parts\u2014it\u2019s to tell you what you actually need. If you\u2019re not sure what resolution is right for your part, just hit us up. We can look at your CAD file, chat about what you\u2019re making, and break it down in plain English, no jargon, no hidden fees. Whether you\u2019re making 10 parts or 10,000, we\u2019ll make sure you get the resolution that fits your needs, not some generic number from a manual.<\/p>\n

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If you\u2019re ready to move forward, we can get you a quote fast, no hoops to jump through. Just reach out and we can walk through your project together.<\/p>\n

SLS Printing<\/a> References<\/p>\n

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  1. Gibson, I., Rosen, D., & Stucker, B. (2015). Additive Manufacturing Technologies: 3D Printing, Rapid Prototyping, and Direct Digital Manufacturing. Springer.<\/li>\n
  2. ASTME International. (2020). Standard Guide for Selective Laser Sintering (SLS) Process Parameters.<\/li>\n
  3. Selective Laser Sintering: A Practical Guide for Industrial Applications. Society of Manufacturing Engineers.<\/li>\n<\/ol>\n
    \n

    Dongguan Xinchuan Precision Manufacturing Co., Ltd.<\/a>
    As one of the most professional sls printing manufacturers and suppliers in China, we offer a quick lead time for customized orders. Please feel free to buy precision sls printing made in China here from our factory. Contact us for quotation.
    Address: #16 Gangjian Road, Changping Town, Dongguan City, Guangdong, China. 523000
    E-mail: FreeQuote@xcprecision.com
    WebSite:     https:\/\/www.xcprecisions.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    If you\u2019ve ever dabbled in additive manufacturing, you\u2019ve probably heard someone throw around \u201cSLS printing\u201d like … What is the resolution of SLS Printing?<\/span>Read more<\/a><\/p>\n","protected":false},"author":955,"featured_media":3613,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[3576],"class_list":["post-3613","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-sls-printing-4288-4e6a97"],"_links":{"self":[{"href":"http:\/\/www.epitexespana.com\/blog\/wp-json\/wp\/v2\/posts\/3613","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.epitexespana.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.epitexespana.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.epitexespana.com\/blog\/wp-json\/wp\/v2\/users\/955"}],"replies":[{"embeddable":true,"href":"http:\/\/www.epitexespana.com\/blog\/wp-json\/wp\/v2\/comments?post=3613"}],"version-history":[{"count":0,"href":"http:\/\/www.epitexespana.com\/blog\/wp-json\/wp\/v2\/posts\/3613\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.epitexespana.com\/blog\/wp-json\/wp\/v2\/posts\/3613"}],"wp:attachment":[{"href":"http:\/\/www.epitexespana.com\/blog\/wp-json\/wp\/v2\/media?parent=3613"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.epitexespana.com\/blog\/wp-json\/wp\/v2\/categories?post=3613"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.epitexespana.com\/blog\/wp-json\/wp\/v2\/tags?post=3613"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}