Resin 3D Printing: What It Is and How It Works – My Guide for Makers 🚀

Hey there, maker! If you've ever been blown away by a miniature with insane detail levels, or seen a prototype with a perfectly smooth surface, chances are you were looking at a resin 3D printed part. Put simply, it's liquid magic that transforms into solid objects with jaw-dropping precision — and it all comes down to light.

It's the secret behind achieving those ultra-fine details that other methods just can't pull off. In this guide, I'm going to share everything I know, straight from the heart, so you can ditch the fear and dive into creating.

What is resin 3D printing and why you're going to love it

Let's cut straight to it. My goal here is to walk you through what this technology actually is and why it's been a complete game-changer for so many of us. By the time you finish reading, you'll know whether resin printing is right for you and how to take your first steps. I've got you covered!

Picture a bottle of very special liquid (the resin). Now imagine that, thanks to precisely controlled UV light, that liquid hardens layer by layer — in almost imperceptible increments — until it forms a solid object. That, in a nutshell, is resin 3D printing.

This technique is the undisputed queen when it comes to spectacular detail. It's what separates a figure with a blank, expressionless face from a miniature where you can count every single belt buckle. If you're into wargaming minis, jewelry, or you need prototypes with flawless finishes, trust me — you're going to fall head over heels for this.

To get a sense of what's out there, take a look at the range of resins for 3D printers available. In my experience, there's a whole universe waiting beyond your standard grey resin.

The big difference vs. FDM printing (filament-based)

You've probably seen 3D printers that run on rolls of plastic — FDM machines. They build parts by depositing threads of melted plastic, almost like an extremely precise hot glue gun. They're fantastic for large, functional parts, no question about it.

But when it comes to detail, resin is in a league of its own. Here's why:

• Surgical-level precision: Light can cure incredibly tiny areas, achieving a resolution that filament simply can't match.

• Silky-smooth surfaces: Layer lines are virtually invisible. The result is a professional finish that comes straight off the printer that way.

• Materials for every need: Resins come with very specific properties. For example, an ABS-like resin for tougher, more durable parts, or a water-washable resin that makes cleanup a whole lot easier.

In this guide, we're going to break down the entire process from start to finish. From choosing your first bottle of resin all the way to holding your finished creation — fully cured and ready to show off. I'm not going to leave you hanging! My goal is to help you get past the intimidation factor and start printing pieces that leave people genuinely speechless. Ready? Let's go!

How liquid magic works: SLA, DLP, and MSLA technologies

So we know what resin printing is, but how exactly does a liquid transform into a solid, detailed object? This is where things get really interesting. Not all resin printers work the same way, so let's break down the three core technologies driving this hobby: SLA, DLP, and MSLA.

Don't let the acronyms put you off. Think of this as a chat over coffee in the workshop — straightforward and to the point.

SLA (Stereolithography): the laser artist

Picture an artist with a surgeon's steady hand and an ultra-precise laser pen. That's essentially how SLA (Stereolithography) works.

A UV laser literally "draws" each layer of your print onto the liquid resin — point by point, line by line, with pinpoint accuracy. It's the original technology, the grandfather of them all, and it remains the undisputed king when it comes to incredibly smooth surfaces and jaw-dropping detail.

• The good: The quality and precision are outstanding. In my experience, the surface finish you can achieve is virtually unbeatable.

• The bad: It's the slowest of the three. Because the laser has to trace the entire surface of each layer, print times can stretch considerably — especially on larger pieces.

DLP (Digital Light Processing): the mini cinema projector

Now, let's shift gears. Think of DLP (Digital Light Processing) as a miniature cinema projector. Instead of a laser tracing each layer, a UV light source projects the complete layer image onto the resin all at once. Flash! The entire layer cures in one go.

This makes it significantly faster than SLA, especially when printing multiple parts at the same time. The time per layer stays the same regardless of whether there's one object or ten on the build plate.

• The good: Speed. It can cure entire layers in just a few seconds.

• The bad: Resolution is tied to the projector's pixel count. Like a photo — zoom in too far and you start seeing pixels (called voxels in 3D printing), which can sometimes show up on fine details and curved edges.

MSLA (Masked Stereolithography): the best of both worlds

And finally, we arrive at MSLA (Masked Stereolithography). This is the technology used by the vast majority of affordable resin printers on the market today — and for very good reason. Think of MSLA as the best of both worlds, combining the strengths of its predecessors.

It uses an LED array as the UV light source, with an LCD screen sitting directly above it acting as a mask. The screen only allows light through in the areas that make up each layer, blocking everything else. Just like DLP, it cures entire layers all at once.

In my opinion, MSLA technology offers the best overall balance of print speed, detail quality, and cost. It's what I recommend almost every time — whether you're just getting started with resin printing or looking to level up without breaking the bank.

This technology is the real reason resin 3D printing has become so accessible to hobbyists everywhere. If you want to dive even deeper, I'd recommend checking out my article on exactly how a resin 3D printer works.

The rise of these technologies — MSLA in particular — has been undeniable, and has made resin 3D printing one of the go-to choices for a huge range of projects.

Resin 3D Printing Technologies Compared

To make everything crystal clear, I've put together a table that summarises the key differences at a glance. This way you can quickly see which technology best suits your needs.

As you can see, each technology has its own strengths. While SLA remains the go-to choice for absolute precision, MSLA has established itself as the all-rounder thanks to its outstanding balance of quality, speed, and affordability.

Your Step-by-Step Resin Printing Workflow

Right then, let's get stuck in! Now that you understand the theory behind the magic, it's time for the fun part: the hands-on process. I'll walk you through the entire workflow step by step, so you know exactly what to do from the moment you have a 3D file to the moment you're admiring your finished print.

I've seen plenty of beginners get stuck at this stage, but don't worry. I've broken it down into four key phases that, once mastered, will turn you into a true resin printing pro.

1. Model Preparation and Slicing

Everything starts on your computer. You can't simply send a 3D file to the printer and hope for the best. First, you need to prepare it using software known as a slicer. The most popular options — and the ones I use myself every day — are Chitubox and Lychee Slicer.

At this stage, your main tasks are:

• Orienting the model: Positioning your model at the correct angle is crucial. It helps minimise support marks on the finished print and ensures it adheres properly to the build plate.

• Adding supports: This is the real secret! Supports act like scaffolding, holding the model in place as it prints and preventing it from warping or detaching. Placing them correctly is an art that improves with practice.

• Adjusting settings: This is where you set your layer thickness and, most importantly, your exposure time — the length of time the UV light cures each layer of resin. Getting this wrong can completely ruin a print.

Once everything is set up, the slicer divides the model into hundreds or thousands of images (layers) and generates a file your printer can read.

A tip from Mr Resin: Don't stress too much about supports at the start. Most slicers have an auto-support function that works well enough to get you going. Use it as your starting point, then fine-tune manually if you spot any areas that need extra support.

2. The Printing Process

With your file loaded onto the USB drive, it's time to fire up the machine. But before you hit "Print", there are a few quick safety and preparation checks to run through.

Here's my personal checklist:

1. Check the resin vat (VAT): Make sure the FEP film at the bottom is clean, free from any cured resin left over from previous prints, and free from deep scratches.

Now you're ready — insert the USB, select your file on the screen, and let the magic begin! The printer will start lowering the build plate and curing the resin, layer by layer.

As you can see in the diagram, while the core principle is the same (curing resin with light), the MSLA method has optimized the process so effectively that it's now the go-to choice for most of us thanks to its speed and efficiency.

3. Washing the print

Once the printer beeps to signal it's done, the part you pull off is covered in liquid, sticky uncured resin. Don't even think about touching it without gloves! This step is essential for achieving a clean, professional finish.

The goal is straightforward: remove all traces of uncured resin. You have two main options:

• Isopropyl Alcohol (IPA): The classic method. Submerge the print in a container of IPA and gently agitate it, or use a soft brush to get into all the nooks and crannies.

• Water-washable resin: My personal favourite for keeping things simple! If you use a water-washable resin, you can rinse the print straight under the tap. It's far more convenient, safer, and more eco-friendly.

In my experience, a wash and cure station (the well-known Wash & Cure machines) is a total game-changer. These devices handle the entire process automatically — faster, cleaner, and with far less mess.

4. Final curing

You're almost there! After washing and thoroughly drying your print, you'll notice it still feels slightly soft. Even though it looks solid, the polymer chains haven't fully formed yet. It needs one final step to reach its maximum hardness and mechanical strength.

This last step is called post-curing, and it simply involves exposing the print to a UV light source for a few minutes. You can use a dedicated curing machine (like the "Cure" function on Wash & Cure stations) or even leave it out in the sun — though the results are less consistent.

This final cure is what makes your print truly strong and durable. Skipping it is one of the most common beginner mistakes I see. A print that hasn't been properly cured can be brittle and warp over time. Don't cut corners on this one!

The world of 3D printing resins: what types are there?

Choosing the right resin is just as important as having a good 3D printer. It's the raw material your creation is built from, and each type has its own characteristics and ideal use cases. Printing a display miniature is a completely different game from printing a mechanical part that needs to take some punishment!

I've got you covered. Let's dive into the different types of resin so you know exactly which one you need for each project. Let's get into it!

Standard or basic resins

If you're just starting out, this is your resin. Standard resins are the most common and affordable option. They're perfect for learning the ropes, dialling in your printer, and printing parts that won't take much punishment — think decorative figures, busts, or display miniatures.

Print quality is solid, detail levels are more than decent, and they're straightforward to work with. It's the ideal starting point for any maker.

ABS-like resins for greater strength and durability

Now we're getting serious. If you need your prints to handle impacts, twisting, or general rough use, ABS-like resin is your best bet. I've put these resins through their paces, and their toughness has genuinely impressed me.

What I love most about ABS-like resin is its durability. It's ideal for functional parts, prototypes that will be handled regularly, electronics enclosures, or even action figures destined for real-world battles. They hold up far better than most people expect!

They cost a little more than standard resins, but the investment is absolutely worth it if strength and toughness are priorities for you.

Water-washable resin: the most convenient option

Let's be honest — cleaning prints with isopropyl alcohol (IPA) can be a real hassle. That's where water-washable resin comes in as a genuine game-changer. As the name suggests, you can rinse your prints straight under the tap.

• Less odour: These resins generally smell far less than traditional resins.

• Safer to use: No need to handle or store large quantities of flammable alcohol at home.

• Greater convenience: Post-processing becomes dramatically simpler and quicker.

In my experience, they're perfect for anyone printing at home who wants a cleaner, more streamlined workflow.

High-detail resins for the sharpest results

Are you a detail fanatic? Want every last hair of your D&D dwarf's beard to be visible? Then you need a high-detail resin — also known as 8K or 12K resin. These are formulated to work with the latest generation of printers and get the absolute most out of them.

They're the top choice for jewellery, dental models, and — of course — competition-level miniatures. If absolute perfection is your goal, this is the resin for you.

Specialist resins

The world of resin doesn't stop there. There are plenty more options for highly specific projects:

• Flexible resins: For printing parts that need to bend or stretch, such as scale model tyres or protective covers.

• Clear and transparent resins: Perfect for water effects, lenses, windows, or any part that needs to let light through.

• Castable resins: Used in jewellery making to create moulds that burn away completely in a kiln without leaving any residue.

This sector is growing at a remarkable pace, with new innovations arriving all the time. Understanding the properties of each resin type is essential — and if you'd like to explore this further, I recommend reading my article on what 3D resins are and their key characteristics.

Resin vs. Filament (FDM): The Great Maker Showdown

Here's the question every maker eventually faces: resin or filament? As someone who's spent countless hours (and blown more than a few fuses) with both technologies, I'll give you my honest take. Forget about crowning a winner — this isn't about which one is "better," it's about which tool is right for your project.

Think of them as two completely different worlds, each with its own superpowers. FDM printing — the kind that uses plastic filament — is your workhorse: reliable, sturdy, and ideal for large functional parts. Resin printing, on the other hand, is the surgeon's scalpel: precise, detail-oriented, and capable of producing stunning miniature works of art.

The Devil Is in the Details (and the Finish)

There's really no debate here: resin wins by a landslide. With FDM, layer lines are always visible and you'll often need to sand and fill to get a smooth surface. With resin, those layers are virtually invisible.

• Resin: Delivers jaw-dropping resolution, capturing tiny details like fabric texture, facial expressions, and fine engravings. Parts come off the printer with a smooth finish right out of the gate.

• FDM: Great for rapid prototypes where fine detail isn't a priority. Layer lines are part of the deal — you can minimize them, but they'll always be there.

To put it in perspective: a 28mm miniature printed in resin will show every buckle on a belt; in FDM, you'll be lucky to make out the belt itself.

Strength and Applications: Beauty or Brute Force?

This is where FDM flexes its muscles. If you need parts that can take a beating — brackets, gears, enclosures — 3D printing filaments like PETG or ABS are usually your best bet. These are engineering-grade materials built to be tough and durable.

That said, resin isn't as fragile as you might think. A properly cured part made from a quality ABS-like resin is surprisingly tough. But if raw strength is your top priority over detail, filament generally has the edge.

Post-Processing: The Work After the Work

Both methods require some extra work once the print is done, but the tasks are very different:

• Resin: Post-processing means washing the part in alcohol (or water, if you're using water-washable resin) and then curing it under UV light. This process calls for gloves, good ventilation, and a bit more care.

• FDM: The main task here is removing supports, which can sometimes leave marks. A bit of sanding to smooth the surface is almost always part of the process.

As you can see, each technology has its time and place. The 3D printing market is booming — and according to this detailed industry report, spectacular growth is projected in the years ahead. That just goes to show that both technologies don't just coexist — they complement each other perfectly!

In the end, most of us reach the same inevitable conclusion: one of each in the workshop! 😉

Safety and Maintenance When Working With Resin

Let's be straight with you: safety comes first when you're working with resin. Yes, resin 3D printing is amazing — but we can't forget that we're handling chemical products. Don't worry, though! With a bit of common sense and the right equipment, it's completely manageable.

Get comfortable — here's my practical, maker-to-maker guide so you can work with total confidence and no nasty surprises.

Your maker armour: personal protective equipment

This is non-negotiable — it's your superhero kit for the workshop. Every time you handle liquid resin or freshly printed parts, make sure you're wearing the following:

• Nitrile gloves: Your best friends! They stop resin from touching your skin, which over time can cause irritation or allergic reactions. Don't take the risk.

• Safety glasses: Your eyes are for admiring the amazing things you print, not for catching splashes. One small slip here can have serious consequences.

• Respirator with carbon filters: Resins release fumes (the infamous VOCs) that you really don't want to be breathing in. A proper respirator filters them out so you can breathe easy.

• Ventilation, ventilation, ventilation: Always print in a well-ventilated space. Opening a window goes a long way, but if you can position an extractor fan near your printer, even better.

Let me bust a common myth! You don't need a NASA-grade lab for this. Gloves, safety glasses, a respirator, and an open window are more than enough to work safely at home.

The maintenance routine that will save you a lot of headaches

Looking after your printer doesn't just make it last longer — it saves you from a whole lot of frustrating failed prints. Trust me, I've learned this the hard way.

• Treat the resin vat (VAT) like gold: After every print, inspect it carefully and make sure no cured resin fragments are stuck to the FEP film. Even a tiny leftover piece can puncture the film on the next print and cause a real mess.

• The FEP film has a lifespan: That transparent film at the bottom of the vat gradually wears out. If it looks heavily scratched or cloudy, it's time to replace it. You'll notice an incredible improvement in print quality!

• Store your resin properly: Keep bottles somewhere cool and dark, well away from sunlight. UV light is resin's kryptonite. If you have leftover resin in the vat and won't be printing for a few days, strain it through a filter and pour it back into the bottle.

Keeping your equipment in top condition is the key to success. If you want to go deeper on this topic, I recommend checking out my full guide on basic maintenance for your resin 3D printer, where I walk you through everything step by step. A prepared maker is worth two!

Conclusion: Let's print!

Well, maker, we've reached the end of this deep dive into the world of resin. I hope you now have a much clearer picture of what resin 3D printing is and how it works! My goal was to give you a solid map — a guide to help you feel confident taking your first steps, or to sharpen the skills you already have.

We've covered what's behind the SLA, DLP, and MSLA acronyms, and walked through the full ritual of preparing, printing, washing, and curing a part. You now know that choosing the right resin is crucial, and that safety always comes first. No more excuses!

Time to get your hands dirty (with gloves on, of course!). Head over to the shop, where I've personally selected the 3D printer resins, printers, and accessories you need to hit the ground running.

And if you fancy sharing your creations, getting questions answered, or just chatting with fellow resin addicts like us, come join our Telegram community: https://t.me/MrResin3D. We help each other out, share discount codes, and keep up with the latest releases! And don't forget to subscribe to the newsletter to grab exclusive deals before anyone else.

✨Happy Printing! 🚀

Frequently asked questions about resin 3D printing

Let's get into it. Here I'll answer once and for all those burning questions you have before diving headfirst into the fascinating world of resin printing. I've got you covered.

Is resin printing really that expensive?

You might think it's a luxury, but you'd be surprised. The startup cost — a basic resin printer and a bottle of resin — is more than reasonable. In fact, it's sometimes even more affordable than a mid-range FDM setup. And the best part? Once you start printing, especially small, highly detailed miniatures, the cost per piece is ridiculously low.

Are resin prints fragile?

That's a myth we need to bust right now! How fragile a print is depends entirely on the type of resin you choose. A standard resin can be on the brittle side, sure — but if you go with an ABS-like resin, you'll be blown away by the strength and durability you can achieve. These prints can take a real beating. That said, a proper final cure is the secret weapon for getting maximum hardness.

Does 3D printing resin smell bad?

I'll be completely straight with you: yes, some resins have their own distinct chemical smell. The odour varies quite a bit between brands and resin types, but the good news is it's easy to manage. The golden rule is to always work in a well-ventilated area. With a window open and a mask on, I promise the smell won't be an issue.

Which resin printer would you recommend for a beginner?

My advice for your first printer is to find the sweet spot. Don't go for the cheapest option on the market, but you also don't need an 8K powerhouse to get started. Look for a machine with at least 4K resolution, a build volume that suits your projects, and most importantly, good reviews for being easy to use. With that, you'll have a fantastic setup to start creating truly impressive prints.