What is 3D resin printing?
3D resin printing is an additive manufacturing technology that uses ultraviolet light to solidify photosensitive resins layer by layer. Unlike FDM printers (which melt plastic), here we start from a liquid that becomes solid with extraordinary precision. The result: parts with very fine details, smooth surfaces and near-professional finishes.
Find here all resins for 3D printing
History and evolution of this technology
Hideo Kodama and Charles Hull
Stereolithography was born in the 1980s, with the pioneering research of Hideo Kodama and the industrial development of Charles Hull, founder of 3D Systems.
From industry to the home
With the expiration of patents, resin printers reached the domestic sphere, becoming more accessible to makers, designers and creatives.
How does 3D resin printing work?
Principle of photopolymerization
A light source (laser, projector or UV LED array) hardens a liquid resin, layer by layer, following the pattern of each model.
Print cycle
- The screen projects a layer.
- The platform lifts slightly.
- The process repeats until the object is complete.
Available technologies: SLA, DLP and MSLA
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SLA: the origin
- Uses a laser to trace layer by layer. High precision, but slower.
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DLP: speed and precision
- Projects each full layer with light. Fast and precise, but with certain optical limitations.
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MSLA: the current standard
- Cures complete layers with an LCD screen and UV LED matrix. High quality + speed. Ideal for home use.
Technical comparison table
| Technology | Light source | Speed | Precision | Cost |
|---|---|---|---|---|
| SLA | Laser | Slow | Very high | High |
| DLP | Projector | Medium | High | Medium |
| MSLA | LED + LCD | Fast | High | Low |
Technical advantages of resin 3D printing
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Precision and resolution
- Ability to print ultra-fine details with smooth walls.
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Isotropy and tolerances
- Parts are strong and consistent across all axes.
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Impermeability
- Watertight parts, ideal for applications requiring fluid or pressure.
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Smooth and realistic finishes
- They look injection-moulded. Great aesthetics without aggressive post-processing.
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Material versatility
- From flexible to dental resins, including heat-resistant or impact-resistant formulations.
Types of resins and what they are used for
There are many resins on the market, and each one has very different characteristics depending on its formula. Some are designed for decorative prints, others for functional or technical parts. Getting to know them will help you avoid mistakes and get the most out of your 3D printer from day one.
- Standard: for general use, ideal for beginners.
- ABS-Like: resistant and functional.
- Fast: for rapid 3D printing without sacrificing quality.
- Water-washable: easy cleaning, no alcohol needed.
- Dental / Jewelry / High Temperature, etc: specific professional applications.
👉 Want a more detailed guide on all resins and their applications? Don't miss this article: Resins for 3D printing: Consumer resin guide
Comparison: Resin 3D printing vs FDM
Choosing between resin 3D printing and FDM is one of the most common questions for those starting out in this world. Both technologies have strengths and limitations, and the best option will depend on your goals: do you need extreme precision or large, resistant parts? This comparison table will help you decide.
👉 You can also read this article where we dive even deeper into the topic: Which is better, filament or resin?
| Feature | Resin | FDM |
| Precision | Very high | Medium |
| Post-processing | Requires washing + curing | Optional |
| Initial cost | Medium/High | Low |
| Maintenance | High upkeep | Low upkeep |
| Applications | Miniatures, jewelry, detailed prototypes | Large parts, functional prototypes |
What do you need to get started?
Taking the first step in resin 3D printing may seem complicated, but with the right equipment and a few precautions, you'll be printing like a professional in no time. Below, we show you the essentials to get off to a great start:?
Recommended 3D printers
- Elegoo Mars 5 / Mars 5 Ultra
- Anycubic Photon Mono 4 / 4 Ultra
- Anycubic Photon Mono M7 / M7 Pro
- Elegoo Saturn 4 Ultra
Essential accessories
- Wash & Cure
- Gloves, mask, spatula, funnels
- Isopropyl alcohol or water washing
Safety and ventilation
Always work in a ventilated and protected space. Uncured resin is toxic.
Real-world applications of resin 3D printing
Resin 3D printing is not just for displaying pretty figures: it has become a powerful tool across multiple industries. Its precision, finish, and versatility make it possible to create parts that range from aesthetic to functional, making it an invaluable ally for both creatives and engineers.
- Miniatures and scale modeling
- Figures and sculpture
- Engineering and functional prototyping
- Jewelry and dental
- Decoration, accessories, art, and cosplay
👉 Want to know more about everything you can create with a resin 3D printer? Check out this article: What can I make with a resin 3D printer? — packed with practical ideas and real-world examples to get the most out of your machine.
Common mistakes and how to avoid them
Although resin 3D printing delivers great results, it can also be frustrating if certain key steps are not followed. Here we show you the most common mistakes among beginners (and not-so-beginners) and how to prevent them from day one.
- Incorrect leveling: always check and calibrate before printing
- Poorly adjusted settings: each resin requires specific exposure times
- Poor post-processing: without proper washing and curing, the part will be weak
👉 You can also read this complete guide: Basic maintenance for your resin 3D printer 🛠️✨ — key tips to extend the life of your equipment and avoid common mistakes from the very first use.
Frequently Asked Questions (FAQ)
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Is resin toxic?
- Yes, it requires gloves, a mask, and ventilation.
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Is it harder than FDM?
- Not necessarily. You just need to learn the correct workflow.
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What resin should I use to start?
- A standard resin or water-washable resin.
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How do I wash and cure my parts?
- Alcohol (or water, depending on the resin) + UV lamp (or Wash & Cure). Always follow the instructions.
✅ Checklist for getting started with resin 3D printing
- ✅ I chose a compatible 3D printer (MSLA, DLP or SLA)
- ✅ I purchased at least 1 litre of resin suitable for my needs (standard resin, water-washable resin...)
- ✅ I have nitrile gloves and a mask for handling resin
- ✅ I have safety glasses and good ventilation in my workspace
- ✅ I have isopropyl alcohol or water available (if I use water-washable resin)
- ✅ I have read the guide and settings for the exposure time recommended by the manufacturer
- ✅ My 3D printer is correctly levelled and ready to print
- ✅ I have a spatula, funnel, tweezers, and trays for washing
- ✅ I have a Wash & Cure station or an alternative for post-processing
- ✅ I have tested a sample file to verify that everything works
This checklist ensures a smooth start. Let's print!
Conclusion: Is it worth it in 2025?
Resin 3D printing combines precision, aesthetics, and versatility. If you are looking for spectacular results with miniatures, jewellery, or prototyping, this technology is for you. And at Mr Resin, we support you with the best products and advice.
✨Happy Printing! 🚀