Loot Studios – Glossary of Resin 3D Printing Terms

Glossary of Resin 3D Printing Terms

The Ultimate Guide to the Hobby of the Future

“When printing, this model has been showing signs of bad adhesion on the build plate quite often. I think I need to either increase exposure time on my SLA printer, change the support structure – either on the software or the STL file itself – or just start looking into getting a new LCD screen”. As the meme goes, this declaration should have been enough to knock Henry Ford out with psychic damage 100 years ago – well, either that or make Arthur C. Clarke weep with excitement.

What I mean to say is: we know 3D printing doesn’t look like an accessible hobby. It seems to have a considerable initial learning curve – and it has, just like any other activity in which you’d want to have good (or at least acceptable) results. The possibilities, however, far outweigh potential hardships. This post aims to provide a non-exhaustive and up-to-date list of the many, many terms, old and new, and their meaning inside the 3D printing universe. As evident from the title, the focus here is in resin – or more precisely, SLA printers (we’ll get to that!). While there are other 3D printing methods with, as always, their own pros and cons, using an SLA printer is currently the most efficient way of making superb and highly detailed miniatures for you regular RPG play sessions (as a completely, of course, random example).

But how do these printers work? SLA (stereolithography) is an additive vat photopolymerization process, which is a very fancy way of saying that it cures, layer by layer, one section of a determined object at a time. That is done with a special laser that emits UV lights. Once enough layers of material are cured on top of one another, you get your whatchamacallit.

405nm UV

Type of light that gets emitted from the 3D printer and is used for curing resins. You’ll often see “405nm” in the title or description of a resin as well, showing that it’s compatible with your printer. 

glossary of resin 3d printing terms
Example of a purchasable resin container. The nm stands for nanometer, or one billionth of a meter, which is the wavelength of UV lights. These have a frequency beyond the visible spectrum and have been chosen due to…eh, I’m digressing. Source: Walmart.

Build Plate

(Almost always a) metallic surface onto which the resin adheres to. This first layer is essential since the next ones will depend on it to manufacture the 3D object. It can be perforated or marked with ridges to provide better support.

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This silvery part is where your resin first sticks to. A finished piece looks like the one on the right. Source: Al Williams, Hackaday.


Computed Aided Design. Both in 2D and 3D, it can refer to using programs to design, draw, model and sculpt digitally.


Computer Aided Manufacturing is the process of using special software to manufacture objects. 3D printers, CNCs and laser cutters are some of the most popular ones that see home use.


Digital Light Processing, another type or resin 3D printer. It uses a sort of projector to create voxels in the resin tank.

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Schematic of a DLP printer. If it looks complicated, it’s because it is. If it does NOT look complicated, Dunning and Kruger would like a word. Source: robotsinthesun.org.

Exposure Time

The period that resin will be subjected to the UV light in order to cure. The more exposure time it gets, the harder it will be (with lots of caveats). First layers, for instance, get more seconds of it.

FEP Film

Fluorinated Ethylene Propylene films are the standard to use in resin printers. It is stretched over the vat and makes contact with both the resin and the UV light generator, enabling the light to pass through in the curing process. It has good chemical resistance and non-stick properties.

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FEP film stretched over its frame. Source: All3DP.


2D section cut from part of a model. What usually gets polymerized at once.

Layer Height

One of the ways to measure the “resolution” of a 3D printed object. The smallest the layer height, the more details you can cram into the same model. SLA printers usually measure theirs in microns (or 1/1000s of a millimeter, mm). 


The process of aligning the Built Plate with your LCD screen or Vat, in order to ensure an uniform curing process and adherence.


Liquid Crystal Display (don’t say LCD display!!!). LCD printers are the type of resin printers that use a monochromatic display to flash UV lights in patterns for curing resin.


Masked Stereolithography Apparatus. Another for of resin 3D printing that is essentially a single UV light source, of which incidence is masked by an LCD screen. It’s what allowed for more compact, cheaper (= for home-use!) 3D printers.

Components of a MSLA printer. Source: 3dnatives.com.


Personal Protection Equipment. Mandatory for handling and post-processing 3D printed parts, until their complete cure. Usually consists of gloves, goggles (or some sort of face shield) and masks with respirators.


Can either mean the procedures required to make 3D printed objects out of resin safe to handle (washing and curing) or those involved in bettering it aesthetically, such as cutting, filing and sanding support leftovers of imperfections.

Print Dimensions

When looking to buy a 3D printer, that’s the biggest possible size of an object that will come out of it. 


Indicates how small the details produced in the horizontal plane can be given to a certain object. The bigger the better for an equal screen size, and that’s where you’ll see terms also present in TV or phone screens: 4K, 6K, 8K…


Thick liquid that gets polymerized into a solid in a 3D printer. There’s an article written by a very handsome person on the many different types of resin and their diverse applications.


A type of software constantly used in 3D printing that takes a virtual 3D object and converts it into instructions for manufacturing with a 3D printer. In this type of program you can tweak layer heights, exposure times and support configurations.

A screen of Chitubox, one of the most popular Slicer softwares used for SLA printing.


One of the many possible file formats often used for 3D models to be printed. Others, but not all of them, can be .3MF, .3DM and .3DS.


Temporary structures that will be printed with an object that can be snapped off afterwards. These ensure all pieces will be precisely connected later. They can be generated in the Slicer software (see Slicer) or built into the model itself.

glossary of resin 3d printing terms
Pre-supported Naedan Sundew, from Loot Studios’ Panshaw Under Siege.


Often called build tank or resin tank. Sealed underneath with the FEP film, where it makes contact with your UV light source.

Just got a minor existential crisis from thinking of making a Flubber reference here. I’m not getting any younger. Source: Nova3D, Aliexpress.


A 3D pixel, the smallest unit of volume the printer can reproduce accurately.

As always, I’m hoping this list has been helpful in giving basic terms and definitions that will help guide you into this activity. Most of these terms have their own sub-definitions, specializations, niche use-cases and the like, but you can slowly build up your vocabulary. If I may provide some motivation on learning the ins and outs of 3D printing, why don’t you check out some 3D printer models, the best types of resin for printing miniatures, and how to remove support marks from your models? Good printing!

Loot Studios can help you print highly detailed minis, statues and props. Choose your favorite bundle from our previous releases or sign up for Fantasy or Sci-Fi to receive a new bundle every month. You can also check out some tips at our YouTube Channel.

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