Guide to 3D Printing and Painting Warhammer Space Marines

Printing your own Warhammer Space Marines in 3D is the ultimate way to build a truly unique army on your own terms — going from a digital file to a full battle-ready squad without spending a fortune on boxed sets. If you're here, you already know it's time to take the plunge and expand your legions.

Pull up a chair, because I'm going to walk you through the whole process, one maker to another — from a raw STL file to a squad of genetically enhanced super-soldiers ready to purge the galaxy. Let's get into it! 🚀

Where to Find and How to Prepare 3D Files for Space Marines

The first step is finding quality STL files — models with solid detail that are optimized to print without giving you a headache. In my experience, the best models usually come from specialized artists who even offer pre-supported versions, an absolute game-changer that saves you a ton of work and failed prints.

Best Sites to Download Space Marine STL Files

When I'm hunting for STLs, I always go to two types of sources. First, the big general repositories — and second, my personal favorites: Patreons and Tribes from specialized artists. That's where the real gems are hiding.

• General platforms: Sites like Cults3D, MyMiniFactory, and Thingiverse are essential starting points. You'll find everything from classic Marines to the most creative custom builds. That said, quality can be a minefield, so I strongly recommend digging through the comments and checking print photos from other users before you download anything.

• Patreon and Tribes: This is where the good stuff lives. Artists like StationForge, The Makers Cult, and Puppetswar are outstanding. For a monthly subscription — usually less than the cost of a single official character model — you get entire armies. Better yet, files typically come pre-supported by professionals, which cuts out a massive chunk of prep work.

Mr. Resin's tip: Before you hit download or buy, study the photos carefully. Do the proportions match the rest of your army? Are the fine details — purity seals, chapter emblems — crisp and well-defined? A quality STL is obvious from a mile away, and spotting it early will save you a lot of frustration.

How to Prepare Your Model in the Slicer

You've got your file. Great. Now comes the critical part: setting it up in your slicer. I almost always use Lychee Slicer, though Chitubox is a solid classic too. This is the software that translates your 3D model into something your printer actually understands, slicing it into ultra-thin layers.

I'm not exaggerating when I say that good prep work accounts for 90% of a successful print.

The first and most important thing is model orientation. My go-to trick, after printing hundreds of Marines, is to tilt the miniature roughly 30–45 degrees backward. The reason is simple: it keeps the small marks left by supports in areas that won't be visible — underneath the backpack, on the back, or on the soles of the boots. Nobody wants a support scar right in the middle of the Imperial aquila.

With your miniature properly oriented, it's time to add supports. Think of these as the scaffolding that holds your model together during printing. Most slicers have an auto-support function that works well as a starting point, but I always recommend going back through manually. Add some thin supports at key points the software may have missed: the tip of a chainsword, fingers, helmet antennae… Those small details make all the difference.

For larger models like a Land Raider tank, the hollow function is a must. You can save a ridiculous amount of resin by hollowing out the piece. Just don't forget to add drain holes! Place a couple at the lowest, most hidden point of the model so any liquid resin trapped inside (which cures under UV light) can escape without issue.

And speaking of legions, if you're looking for inspiration or lore on a particular chapter, check out my guide to the most iconic Space Marine chapters.

Finally, one piece of advice worth its weight in gold: invest in a quality high-definition resin. The difference in detail on power armour, rivets, and engravings is simply stunning. It's the finishing touch that makes all your hard work truly worth it.

What resin and printer settings should I use for Space Marines?

Resin choice and printer settings are crucial for achieving professional-level detail on your miniatures. Not all resins are created equal — the right pick depends on whether you're going for maximum detail on a display piece or greater durability for gaming miniatures.

Seriously, not all resins are the same — not even close. What works perfectly for printing a large functional part will likely be a disaster when it comes to capturing the microscopic details of power armour. Trust me, the right material makes all the difference.

After countless hours and print failures, I've learned — sometimes the hard way — that the right choice changes completely depending on what you're after. Want maximum detail for a display piece? Or do you need minis that can take a knock during a game? Let's break it down.

What's the perfect resin for my legions?

Think of resin as the lifeblood of your miniatures. For those ultra-fine details on your Space Marines — chapter emblems, purity seals, or helmet grilles — my advice is to go all in: use a high-definition resin.

These resins, often labelled as 8K or higher, are formulated to capture details that are barely visible to the naked eye. The results are, quite simply, on another level.

Of course, if your marines are heading to the tabletop, brittleness becomes your worst enemy. For that, my go-to is ABS-Like resin. It offers impact resistance and a slight flexibility that standard resins can't come close to matching. With ABS-Like, those chainswords, antennae, and delicate decorative parts have a much better chance of surviving an accidental drop.

Brands like Anycubic and Elegoo both have excellent options in each category that I've tested extensively with great results.

Mr. Resin's Pro Tip: I love experimenting with resin mixing. One trick that works brilliantly for me is adding 10-15% of flexible resin to my favourite 8K resin. You get the best of both worlds: incredible detail with extra toughness that you'll really appreciate when your captain takes a tumble off the table.

To make things easier, I've put together this table to help you pick the perfect resin for your Space Marines.

Resin Comparison Chart for Printing Space Marines

Choosing the right resin is the difference between a miniature you're afraid to touch and one you're proud to bring to the gaming table.

What printer settings should I use for the glory of the Emperor?

Having the best resin on the market means nothing if your printer settings are all over the place. This is where legends are made — and where hours of print time get thrown in the bin. The two key parameters are layer height and exposure time.

For layer height, 0.05 mm (50 microns) is a solid starting point. It strikes a great balance between speed and detail. But if you're printing a special character — a Captain or a Librarian — I'd encourage you to drop down to 0.03 mm (30 microns). Yes, the print will take longer, but the difference in armour smoothness and edge sharpness is night and day.

Exposure time is your printer's heartbeat — the length of time UV light cures each resin layer at a wavelength of 405nm. This value varies depending on your resin and your machine's power output. As a general reference:

• Standard resins (grey): Typically need 2–3 seconds per layer.
• Fast resins: Can go as low as 1.5–2 seconds.
• Dark resins (black): Require longer exposure times, around 3–4 seconds.

To dial things in properly, always print a calibration test. My favourites are the "Cones of Calibration" or "AmeraLabs Town". These are small files that take about 15 minutes to print and will immediately tell you if you're over-exposing (bloated details) or under-exposing (missing parts). It's the best time investment you can make.

If you want to go deeper and truly master your materials, check out my complete guide to resin types for 3D printing, where I break down all of these concepts in much more detail.

How do I post-process my miniatures to get a perfect finish?

Good post-processing is essential for turning a freshly printed part into a professional-quality miniature. This process — which includes washing, support removal, and UV curing — is key to achieving a smooth, detailed, and durable finish that's ready for painting.

If you rush this stage, even the best-printed Space Marine can end up tacky, with blurry details or so brittle it snaps if you so much as look at it wrong.

What's the best approach for removing your print and supports?

First things first: getting the print off the build plate. Don't try to force it off — instead, slide your spatula gently under one corner and apply steady, controlled pressure until it releases. Patience is everything here.

Here's a golden tip that many people skip: remove your supports BEFORE the final cure. The resin is still soft and flexible at this stage, which means you can snip supports away with fine flush cutters and leave barely a mark. If you wait until after curing, the print will be rock hard and you're far more likely to tear chunks out of it.

A trick I've picked up over the years: Always start with the thicker supports and work your way down to the finer ones. Try to cut as flush to the miniature as possible without actually touching it. It's better to leave a small nub that you can sand down later than to rip a chunk out of the armour.

What should I use for cleaning: isopropyl alcohol or water?

With the supports removed, it's time to clean off any remaining liquid resin. You have two main options, depending on which resin you're using.

• Isopropyl Alcohol (IPA): The classic method and the most effective. Submerge the miniature in a container of post-processing alcohol and gently agitate it for 2–3 minutes. If you have a wash station, the magnetic vortex will do the work for you. IPA is foolproof, but don't forget to wear gloves and ensure the area is well ventilated.
• Water-Washable Resins: A fantastic alternative for avoiding fumes and handling alcohol. The process is the same: a few minutes soaking in water with some agitation. If you want to dive deeper into the topic, I have a full guide on how Anycubic wash and cure stations work.

After washing, it's essential that the part is completely dry before curing. I use a small air compressor to blow into all the nooks and crannies, but leaving it to air dry on some kitchen paper works perfectly well too.

UV curing: the final step that makes all the difference

Curing is the process where ultraviolet (UV) light hardens the resin, giving it its final strength and finish. You can use a dedicated curing station (the most recommended option) or rely on sunlight, though that method is far less precise.

But be careful not to overdo it! Over-curing can make the resin so brittle that energy swords or antennae snap at the slightest touch.

Recommended curing times:

• Standard Space Marine: 2–3 minutes in a UV station, flipping halfway through to ensure even curing.
• Large piece (e.g. Dreadnought): 4–5 minutes, making sure the UV light reaches the entire surface.
• Thin or delicate parts: 1–2 minutes maximum. Here it's better to under-cure than over-cure.

Fixing small imperfections

Even with the cleanest process, you may still end up with small support marks or a visible layer line here and there. Don't panic! To fill those tiny pits, I use a small amount of plastic putty applied with the tip of a modelling blade.

Once the putty is dry, a very light pass with fine-grit sandpaper (800 grit or higher) will leave the surface ready for primer. Your marine is now clean and prepped, ready to receive its colours.

What paints and techniques should I use to bring my Space Marines to life?

The key step for getting paint to bond properly to resin is priming, which creates a uniform base coat. Your choice of primer colour — black for deeper shadows, white for vibrant colours, or grey as a balanced middle ground — will have a real impact on the final look of your chapter's colour scheme.

Think of primer as the invisible bond between resin and paint. Without a solid base coat, acrylic paint will slide off, cover unevenly, and chip if you so much as look at it wrong. You have two ways to apply it: the classic rattle can spray or an airbrush. Personally, I always reach for the airbrush — the level of control and the fine finish you get is on another level entirely.

Why does primer colour matter so much?

It matters more than you might think. The colour of the primer you choose will shape your entire painting process. Each one has its own trick and will make your life easier (or harder) depending on what you're going for.

• Black: The safe choice, especially for dark colour schemes or if you're just starting out. Any corner your brush can't reach stays black, creating a natural shadow. It's very forgiving of mistakes.
• White: Essential if you want super vivid, bright colours like yellows or deep reds. Any paint you apply on top will hit maximum saturation. Just be careful though — any mistake will stand out a mile.
• Grey: The ultimate all-rounder. If you're unsure, go grey. It strikes a perfect balance that makes both light and dark tones look great without having to fight them.

What colour palettes and techniques do I use for legendary chapters?

With your mini primed and fully dry, it's time for the moment of truth. Space Marines are more popular than ever, largely thanks to the massive success of Warhammer 40,000: Space Marine II, which has shifted 7 million copies in under a year. That runaway hit has sent demand for painting supplies through the roof, and I'm going to give you the keys to making yours look display-worthy. You can read more about this phenomenon in Gamereactor's write-up .

To get started, grab a solid selection of paints and some decent brushes. From experience, I can tell you that the Vallejo ranges (Game Color for brush and Game Air for airbrush) are a reliable choice for the quality-to-price ratio.

Here's a quick cheat sheet with basic recipes for some iconic chapters:

Mr. Resin's tip: If you're just getting started, Vallejo Xpress Color inks are an absolute game-changer. Simply apply your base coat, then lay down a generous layer of Xpress ink over the top. The results are like magic — the ink naturally flows into the recesses to create shading while leaving the raised edges lighter, all in a single step.

Once you've got your base coat and shading sorted, the next step to really level up your miniature is highlighting. The go-to technique here is edge highlighting. It's simply a matter of loading a fine brush with a colour slightly lighter than your base and carefully picking out the edges and raised ridges of the armour. If you want to go deeper on this, check out our dedicated guide on how to paint Ultramarines step by step, where we break these techniques down in full detail.

How do I take my Space Marines to the next level with transfers and special effects?

Finishing touches like decals, weathering effects and varnishes are what truly separate a well-painted miniature from a genuine display piece. Mastering these techniques — inspired by titles like Warhammer 40,000: Space Marine II — will help you achieve a professional, realistic finish.

The level of detail in the hobby has absolutely skyrocketed in recent years. A big part of that is down to games like Warhammer 40,000: Space Marine II, which has left the entire community blown away — and rightly so. With a Metacritic score of 82, it's become a landmark visual reference for miniature painters everywhere.

The game's massive success has inspired countless hobbyists to push for that same level of realism in their models, driving huge interest in more professional paints, weathering products and special effects. If you want to find out more about how this milestone has shaped the community, this article on DLCompare covers it really well.

What's the trick to applying decals without any issues?

Decals are the bane of many painters' existence, especially when applying them to curved surfaces like a Space Marine's shoulder pad. The usual result? Silvering, wrinkles, and that dreaded sticker effect.

My secret weapon for taming them is decal softening solution.

First things first — apply a thin coat of gloss varnish wherever you're placing the decal. This creates a smooth surface that makes the whole process much easier.

• Step 1: Using a brush, apply a small drop of decal setting solution (such as Microset) to the shoulder pad to improve adhesion.
• Step 2: Once the decal has soaked in water, slide it into position over the prepared area. Use your brush to nudge it exactly where you want it.
• Step 3: Now for the magic. Carefully apply a coat of decal softening solution (like Vallejo Decal Softener) over the placed decal. This solution slightly softens the decal film, allowing it to conform to the curved surface. Whatever you do — don't touch it while it's working!

Once it's completely dry, seal everything with another coat of varnish. Say goodbye to the sticker effect for good!

What varnish should I use to protect my masterpiece?

After spending hours and hours painting, the last thing you want is a simple knock ruining all that hard work. Varnishing is, quite simply, non-negotiable. Varnishes don't just protect your miniature — they also unify the overall finish and eliminate any unwanted shine.

My personal tip: For bulletproof protection, I first apply an all-over coat of gloss varnish (it's the toughest and most durable). Once that's dry, I go in with matte or satin varnish wherever needed to achieve the final finish I'm after. Double the protection, perfect results.

How do I create special effects for a truly jaw-dropping result?

This is where we put the finishing touches on everything. A well-executed plasma glow or a beautifully detailed base can turn your Space Marine into the centrepiece of the entire gaming table.

• Plasma weapon effect: Paint the weapon area pure white. Then, using a highly thinned blue or green, build up very thin layers around the edges, letting the white in the centre show through.
• Blood and gore effects: Don't even think about using regular red paint. Products like Vallejo's FX Bloody Red have the consistency and shine to perfectly mimic fresh blood.
• Helmet lenses: Paint the lens black. Then, in one lower corner, paint a crescent in a dark colour, and on top of that a smaller crescent in a brighter shade. Finish with a tiny dot of pure white in the opposite upper corner. Instant gemstone effect!
• Bases that bring your miniature to life: Please don't leave your base plain black. The Vallejo Diorama FX range has fantastic texture pastes for simulating mud, snow, or sand. Simply apply the paste with a palette knife and let it dry.

Frequently asked questions about Space Marines and 3D printing

I've put together the most common questions I get asked — those little stumbling blocks we all run into when we start printing our own Warhammer Space Marines. The aim is to give you straight answers and practical solutions that save you time and a whole lot of frustration. Let's dive in!

Is it legal to 3D print Warhammer miniatures?

Printing minis for your own personal use is a widely accepted and common practice in the community. Legal issues only arise if you try to sell those prints or distribute copyrighted files.

Also, if you're planning to attend an official Games Workshop tournament, you'll most likely be required to use only official brand miniatures.

What should I do if my Space Marine print fails?

Don't panic — it happens to everyone. My personal approach is straightforward: first, I check that the build plate is properly levelled and that the ambient temperature is stable (between 20–25 °C).

Then I make sure the miniature has enough supports, especially on "islands" (sections that start printing in mid-air). Finally, check that the tank film (FEP, nFEP, or ACF) is clean and undamaged.

Do I need an airbrush to paint Space Marines?

You don't strictly need one, but it's one of the best investments you'll make in this hobby if you're planning to paint a full army. An airbrush saves a huge amount of time when applying primer and base coats.

That said, with quality brushes and a steady hand, you can absolutely achieve display-level results without one.

How do I stop swords and antennae from breaking?

Ah, the classic nightmare of thin, delicate parts. My personal trick that never fails is to use resins with added toughness, such as ABS-Like resins, which have a degree of flexibility.

And a golden rule: don't over-cure your print under UV light — too much curing makes it extremely brittle and fragile.

Conclusion:

What a journey! We've covered the entire process, from tracking down the perfect STL to applying that final coat of varnish on your Warhammer Space Marines. I hope this guide gives you the confidence to take the plunge and start building your own legions.

Remember that 3D printing and painting are a journey of learning. Try things, make mistakes, experiment with resins and colours, and most importantly — enjoy the process! There's nothing quite like seeing your army, built by your own hands, deployed on the gaming table.