{"id":164836,"date":"2022-05-30T11:12:14","date_gmt":"2022-05-30T03:12:14","guid":{"rendered":"https:\/\/facfox.com\/docs\/?post_type=kb&#038;p=164836"},"modified":"2022-08-12T11:01:00","modified_gmt":"2022-08-12T03:01:00","slug":"hygroscopy-3d-printing-what-it-is-how-to-deal-with-it","status":"publish","type":"kb","link":"https:\/\/facfox.com\/docs\/kb\/hygroscopy-3d-printing-what-it-is-how-to-deal-with-it","title":{"rendered":"Hygroscopy (3D Printing): What It Is &#038; How to Deal With It"},"content":{"rendered":"<div class=\"container container--l container--space\">\n<div class=\"section\">\n<p class=\"paragraph paragraph--emphasized\">Hygroscopy is the unseen killer of 3D prints. Find out what it is, its effects on printing, and how you can thwart it!<\/p>\n<\/div>\n<\/div>\n<div class=\"toc-layout__toc\">\n<h3 class=\"headline headline--xxl\">What Is It?<\/h3>\n<\/div>\n<div>\n<figure style=\"width: 1000px\" class=\"wp-caption aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/img.facfox.com\/imgs\/2022\/06\/06\/619332da63ba08ae.png\" alt=\"\" width=\"1000\" height=\"562\" \/><figcaption class=\"wp-caption-text\">The orange filament wasn&#8217;t dry before printing (Source: Flibbid via Twitter)<\/figcaption><\/figure>\n<\/div>\n<div>\n<p>Have you ever printed with old filament or material that\u2019s been exposed to humidity? If you have, you probably ran into some print quality issues. Most likely, that\u2019s because of\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Hygroscopy\" target=\"_blank\" rel=\"noopener noreferrer\">hygroscopy<\/a>, which with respect to 3D printing, is the occurrence of filament absorbing moisture.<\/p>\n<p>Most filaments are naturally hygroscopic \u2013 some more than others. This means that, when there\u2019s moisture in the air (humidity), filament naturally absorbs it. Though difficult to spot beforehand, hygroscopy is a factor that negatively affects 3D print quality.<\/p>\n<p>Moisture within printing material can\u2019t be seen, but when you heat it up in the hot end of a 3D printer, you can. Essentially, the water boils as the filament melts, and this causes bubbling.<\/p>\n<p>In this article, we\u2019ll go into more detail about how hygroscopy affects print quality, which materials are and aren\u2019t hygroscopic, and how you can prevent hygroscopy from ruining your prints.<\/p>\n<\/div>\n<div>\n<h3 class=\"headline headline--xxl\">Effects on Print Quality<\/h3>\n<\/div>\n<div>\n<figure style=\"width: 1000px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" src=\"https:\/\/img.facfox.com\/imgs\/2022\/06\/06\/f7e8a304aea9e22b.png\" alt=\"\" width=\"1000\" height=\"550\" \/><figcaption class=\"wp-caption-text\">Can you guess which print was done with dry filament? (Source: bobstro via PrusaPrinters)<\/figcaption><\/figure>\n<\/div>\n<div>\n<p>When a hygroscopic material absorbs water, printing with the \u201cwet\u201d filament can lead to an abundance of print errors, including the following:<\/p>\n<ul>\n<li>Bubbles in print layers<\/li>\n<li><a href=\"https:\/\/all3dp.com\/2\/filament-jam-3-easy-fixes\/\">Extruder jams<\/a><\/li>\n<li>Brittle, soft, and fragile parts<\/li>\n<li>Poor\u00a0<a href=\"https:\/\/all3dp.com\/2\/3d-printer-bed-adhesion-all-you-need-to-know\/\">bed adhesion<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Hygroscopy\" target=\"_blank\" rel=\"noopener noreferrer\">Extrusion<\/a>\u00a0issues<\/li>\n<\/ul>\n<p>If you look at the picture above, you can see the difference between printing with wet filament (bottom) and dry filament (top).<\/p>\n<p>Now that we know what can happen, let\u2019s take a closer look at which filaments are more hygroscopic than others.<\/p>\n<\/div>\n<div>\n<h3 class=\"headline headline--xxl\">Most Affected Materials<\/h3>\n<\/div>\n<div>\n<figure style=\"width: 1000px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" src=\"https:\/\/img.facfox.com\/imgs\/2022\/06\/06\/c993f52ddce17516.png\" alt=\"\" width=\"1000\" height=\"596\" \/><figcaption class=\"wp-caption-text\">Nylon is a very hygroscopic filament (Source: Taylor Landry via MatterHackers)<\/figcaption><\/figure>\n<\/div>\n<div>\n<p>Before we discuss which materials are most affected, you should know that all of them are somewhat hygroscopic. That said, there\u2019s a large spectrum of how hygroscopic material can be.<\/p>\n<p>Properly storing and, when necessary, drying all your filaments is a good idea, but just so you\u2019re aware, the following materials are most likely to get wet quickly:<\/p>\n<ul>\n<li><a href=\"https:\/\/all3dp.com\/topic\/abs\/\" target=\"_blank\" rel=\"noopener\">ABS<\/a><\/li>\n<li><a href=\"https:\/\/all3dp.com\/topic\/nylon\/\" target=\"_blank\" rel=\"noopener\">Nylon<\/a><\/li>\n<li><a href=\"https:\/\/all3dp.com\/2\/polycarbonate-pc-3d-printing-all-you-need-to-know\/\" target=\"_blank\" rel=\"noopener\">Polycarbonate (PC)<\/a><\/li>\n<li><a href=\"https:\/\/all3dp.com\/topic\/petg\" target=\"_blank\" rel=\"noopener\">PETG<\/a><\/li>\n<li><a href=\"https:\/\/all3dp.com\/2\/pva-filament-explained-and-compared\/\" target=\"_blank\" rel=\"noopener\">PVA<\/a><\/li>\n<li><a href=\"https:\/\/all3dp.com\/topic\/tpu\/\" target=\"_blank\" rel=\"noopener\">TPU<\/a><\/li>\n<li><a href=\"https:\/\/all3dp.com\/2\/flexible-3d-printing-filament-which-should-you-chose\/\" target=\"_blank\" rel=\"noopener\">Many flexibles<\/a><\/li>\n<\/ul>\n<h3><strong>Which Are Less Hygroscopic?<\/strong><\/h3>\n<p>Although there are no completely non-hygroscopic materials, there are some that are less prone to hygroscopic issues. The following materials are less vulnerable to absorbing moisture than those above:<\/p>\n<ul>\n<li><a href=\"https:\/\/all3dp.com\/topic\/pla-3d-printing\" target=\"_blank\" rel=\"noopener\">PLA<\/a><\/li>\n<li><a href=\"https:\/\/all3dp.com\/2\/asa-filament-explained-and-compared\/\" target=\"_blank\" rel=\"noopener\">ASA<\/a><\/li>\n<li><a href=\"https:\/\/all3dp.com\/1\/polypropylene-pp-all-you-need-to-know\/\" target=\"_blank\" rel=\"noopener\">Polypropylene (PP)<\/a><\/li>\n<\/ul>\n<\/div>\n<div>\n<h3 class=\"headline headline--xxl\">Prevention (Storage)<\/h3>\n<\/div>\n<div>\n<figure style=\"width: 1000px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/img.facfox.com\/imgs\/2022\/06\/06\/8873c66453d6e695.png\" alt=\"\" width=\"1000\" height=\"562\" \/><figcaption class=\"wp-caption-text\">Using a dry box can yield better prints (Source: Becky Stern via YouTube)<\/figcaption><\/figure>\n<\/div>\n<div>\n<p>Knowing the common problems and main culprits, let\u2019s talk about how to actually deal with hygroscopy. Naturally, the first step is prevention.<\/p>\n<p>Generally speaking, the key is to keep filament in dry, watertight containment. You should do this as much as possible between prints.<\/p>\n<p>A solid storage option is a dry box, which will physically separate your filament from the surrounding environment. This method works for both long- and short-term storage, as long as there\u2019s some sort of watertight seal at the opening.<\/p>\n<p>If you\u2019re looking to store some filament for up to a few days, a tightly-sealed bag will do just fine. In this case, consider using\u00a0<span class=\"link\" data-action=\"modal-open\" data-modal-ajax=\"\/en\/product-overlay\/128694\/limit\/0\/\">desiccants<\/span>\u00a0to remove oxygen and moisture.<\/p>\n<\/div>\n<div>\n<h3 class=\"headline headline--xxl\">Solutions (Drying)<\/h3>\n<\/div>\n<div>\n<figure style=\"width: 1000px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/img.facfox.com\/imgs\/2022\/06\/06\/d6d147762f2dda53.png\" alt=\"\" width=\"1000\" height=\"666\" \/><figcaption class=\"wp-caption-text\">PVB is hygroscopic, so dry it before printing (Source: random-builder via Thingiverse)<\/figcaption><\/figure>\n<\/div>\n<div>\n<h3>Detecting Wet Filament<\/h3>\n<p>In determining if your filament is \u201cwet\u201d, the first thing you should think about is a spool\u2019s age and how well it\u2019s been stored. If you\u2019ve had filament for a while and you haven\u2019t been strict about its storage, chances are it\u2019s absorbed some water. In that case, pay attention to how it prints. Lower-than-expected print quality could be the result.<\/p>\n<p>If a spool of filament has absorbed a decent amount of moisture, you can do a simple test. All you need to do is push some filament through your nozzle and listen closely. You\u2019ll know you have a wet filament if you hear a crackling noise as the filament is extruded. Another indication is if you see steam coming off of a print (when hot meets cold) or any of the previously mentioned print problems.<\/p>\n<h3><strong>Drying Filament<\/strong><\/h3>\n<p>You\u2019ve done the tests, and your filament is wet. Time to dry it.<\/p>\n<p>In fact, drying filament is easy. Simple put the spool in the oven and set the temperature to around 40-50 degrees Celsius (approximately 100-120 degrees Fahrenheit). Then, leave it there for around 4-6 hours.<\/p>\n<p>For even more and better filament drying, you can put desiccants in the oven with the filament too. Printing with your filament from a dry box is also a good idea for the constant prevention of hygroscopy-related errors.<\/p>\n<\/div>\n<div><\/div>\n<div><\/div>\n<div>Source: <a href=\"https:\/\/all3dp.com\/2\/hygrosopy-3d-printing-guide\/\">https:\/\/all3dp.com\/2\/hygrosopy-3d-printing-guide\/<\/a><\/div>\n<div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Hygroscopy is the unseen killer of 3D prints. Find out what it is, its effects on printing, and how you can thwart it! What Is It? Have you ever printed with old filament or material that\u2019s been exposed to humidity? If you have, you probably ran into some print quality issues. Most likely, that\u2019s because [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"kbtopic":[137],"kbtag":[126,740,61],"class_list":["post-164836","kb","type-kb","status-publish","hentry","kbtopic-case","kbtag-3d-printing","kbtag-hygroscopy","kbtag-material"],"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>Hygroscopy (3D Printing): What It Is &amp; How to Deal With It - FacFox Docs<\/title>\n<meta name=\"description\" content=\"Hygroscopy is the unseen killer of 3D prints. Find out what it is, its effects on printing, and how you can thwart it! What Is It? Have you ever printed Hygroscopy is the unseen killer of 3D prints. 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