Pros and Cons
Resin 3D printing has revolutionized the world of miniatures and detailed models, offering precision that filament printing can’t match. However, one of the biggest challenges with resin printing is post-processing, specifically cleaning the prints. Traditional resins require isopropyl alcohol (IPA) or other solvents for cleaning, while water-washable resinsoffer an alternative that can be rinsed using just water.
But is water-washable resin actually better? In this article, we’ll explore the pros and cons of water-washable resin vs. standard resin, helping you decide which option is best for your 3D printing needs.
What is Water-Washable Resin?
Water-washable resin is a type of photopolymer resin designed to be cleaned with water instead of alcohol-based solvents. This makes post-processing easier, safer, and more environmentally friendly in comparison to standard resins, which require IPA or other chemicals for cleaning.
Although water-washable resin sounds like the perfect solution, it has its trade-offs in terms of strength, flexibility, and long-term durability.
Pros and Cons of Water-Washable Resin vs. Standard Resin
| Feature | Water-Washable Resin | Standard Resin |
|---|---|---|
| Cleaning Method | Cleaned with water | Requires IPA or solvent |
| Ease of Use | Easier, no strong chemicals | Requires careful handling |
| Odor | Lower odor | Stronger chemical smell |
| Toxicity | Less toxic, safer handling | More hazardous if not handled properly |
| Strength & Durability | More brittle, can crack over time | Generally stronger and more flexible |
| Detail Quality | High, but slightly softer | High, with sharper details |
| UV Resistance | Tends to yellow faster | Better long-term UV resistance |
| Cost | Slightly more expensive | Usually cheaper |
| Environmental Impact | Must dispose of water properly | IPA disposal requires special handling |
| Curing Time | Can over-cure easily if exposed to water | More forgiving curing process |
Advantages of Water-Washable Resin
1. Easier and Safer Post-Processing
One of the biggest advantages of water-washable resin is that it can be cleaned with tap water rather than requiring IPA or other solvents. This makes it a great choice for users who don’t want to deal with chemical fumes or store flammable liquids.
- No need for ventilation or strong alcohol-based cleaners.
- Safer to handle, reducing exposure to harsh chemicals.
- No need to repeatedly buy IPA, which can be expensive over time.
2. Lower Odor and Less Toxicity
Water-washable resin generally has a lower odor than standard resins, making it more pleasant to work with indoors. While all resins should still be handled with care, water-washable resin is considered less irritating to the skin and respiratory system.
3. Environmentally Friendlier (If Disposed of Properly)
Since it doesn’t require IPA, many assume water-washable resin is better for the environment. However, wastewater from cleaning prints must still be treated before disposal, as it contains uncured resin, which can be harmful to aquatic life.
To dispose of wastewater properly:
- Expose the water to direct sunlight or UV light to cure any resin particles.
- Once the resin is fully solidified, filter it out and dispose of the solid waste in the trash.
- Never pour uncured resin water down the drain!
Disadvantages of Water-Washable Resin
1. Brittle Prints and Lower Durability
One of the main drawbacks of water-washable resin is that prints tend to be more brittle than those made with standard resin. This means they are more likely to crack or break under stress, making them less ideal for functional parts or high-impact applications.
- Thin parts and joints may snap easily.
- Not as flexible as standard resin.
- Over time, prints may develop microfractures, especially if exposed to moisture.
2. Can Over-Cure When Exposed to Water
Water-washable resin is more sensitive to UV exposure, meaning it can over-cure if left in water too long. This can result in prints that become extra brittle or develop a chalky surface.
- Always dry prints completely after washing.
- Avoid leaving prints in water too long, as they may weaken.
- UV curing times may need to be adjusted to avoid over-curing.
3. More Expensive Than Standard Resin
While prices are becoming more competitive, water-washable resin is often slightly more expensive than standard resin. If you print in large volumes, the cost difference can add up.
- Water-washable resin costs 10-20% more on average than standard resin.
- Some specialized versions (e.g., tough or flexible water-washable resins) are even more expensive.
When to Choose Water-Washable Resin?
Water-washable resin is a great choice if:
✅ You want an easier, safer cleaning process.
✅ You print indoor-friendly models and want to reduce fumes.
✅ You are printing miniatures or non-functional parts that don’t require extra durability.
✅ You are willing to dispose of wastewater properly.
When to Stick with Standard Resin?
Standard resin may be the better option if:
✅ You need stronger, more impact-resistant prints.
✅ You work with functional parts or models that require durability.
✅ You want sharper details with minimal risk of over-curing.
✅ You don’t mind handling IPA or other solvents for cleaning.
Conclusion: Which Resin Should You Use?
Both water-washable resin and standard resin have their pros and cons, and the best choice depends on your priorities.
| If you prioritize… | Best Option |
|---|---|
| Ease of use & safer post-processing | Water-Washable Resin |
| Stronger, more durable prints | Standard Resin |
| Indoor-friendly, low odor | Water-Washable Resin |
| Fine details & long-term stability | Standard Resin |
| Environmentally conscious approach | Water-Washable (if disposed of properly) |
For miniatures and hobby models, water-washable resin is a great choice due to its ease of use and low odor. However, if you need stronger, more impact-resistant prints, standard resin remains the better option.
Ultimately, choosing the right resin comes down to balancing convenience, strength, and post-processing preferences.
What’s Your Experience?
Have you used both water-washable and standard resin? Which one do you prefer and why? Let us know in the comments below!
Adeptus Printicus 
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