Do All 3D Printing Resins Smell?
Not all resins smell the same, but all photopolymer resins release some level of odour due to their chemical composition. Standard resins have a distinctive, pungent smell, while plant-based formulations significantly reduce this issue.
Resin odour comes primarily from monomers and oligomers that evaporate during the UV curing process. Traditional resins use acrylates and methacrylates that release vapours with that harsh, chemical smell we're all familiar with. It's virtually impossible to eliminate 100% of the odour, as the photopolymerisation reaction itself releases volatile compounds.
What has changed in recent years is the intensity. Modern resins — especially those based on plant-derived ingredients like soy — have managed to dramatically reduce both the smell and the toxicity of the vapours. In the full Mr Resin 3D printer resin catalogue, you can see how more and more manufacturers are moving towards these gentler formulations.
Which 3D Printing Resins Smell the Least?
The lowest-odour resins are plant-based formulations, followed by water-washable resins and bio-resins. Brands like Anycubic, eSUN, and DR.3D have developed versions with up to 80% less odour compared to standard resins.
One of the most popular options is the Anycubic Plant-Based Low Odour Resin, made with soy extracts and completely free of BPA and benzene. This plant-based formulation not only reduces smell but is also safer for home use.
Water-washable resins also tend to smell less, partly due to their lower viscosity (around 120 cps compared to 200–300 cps for standard resins), which allows for more controlled evaporation. eSUN's eResin-PLA, based on cornstarch, offers decent mechanical properties (tensile strength of 37–48 MPa) while maintaining a very low odour profile.
| Resin Type | Odour Level | Typical Viscosity | Relative Price |
|---|---|---|---|
| Standard | High | 200–350 cP | Base |
| Plant-based | Very low | 200–300 cP | +20–30% |
| Water-washable | Low | 120 cP | +15–25% |
| Bio-resin PLA | Very low | 200–300 cP | +30–40% |
Do Enclosed 3D Printers Reduce Resin Odour?
Enclosed printers with active filtration systems can significantly reduce perceived odour, but they don't eliminate it entirely. Activated carbon filters capture between 60–80% of VOCs (volatile organic compounds), and are most effective during the first few months of use.
A good example is the Anycubic Photon M3 Premium, which features built-in activated carbon filters as part of its enclosed design. Users on technical forums report that after 11 hours of continuous printing with ABS-like resin, only a "faint smell" remains — a far cry from the overwhelming fumes of an open-frame printer.
The main issue is filter saturation. Experts recommend replacing them every 3–6 months depending on how heavily the printer is used, as they lose effectiveness fairly quickly. A saturated filter doesn't just stop absorbing odours — it can actually start releasing them back into the air.
- New filters: 70-80% odour reduction
- Filters after 3 months: 40-50% reduction
- Filters after 6+ months: practically useless
- Replacement cost: £15-30 every 3-6 months
How to reduce resin smell when printing at home?
To minimise odour, you need to combine low-odour resins, active ventilation, and immediate clean-up of any spills. An air extractor vented to the outside is more effective than any activated carbon filter for long-term home use.
The most effective strategy starts with choosing the right resin. Water-washable resins not only smell less during printing but completely eliminate the isopropyl alcohol smell during post-processing. This is especially important because the most noticeable odour often comes not from printing itself, but from cleaning with 99.9% isopropyl alcohol.
For ventilation, a simple 100 CFM bathroom extractor fan connected to a flexible hose directed towards a window can make a huge difference. Users report being able to print in rooms as small as 10m² without any unpleasant smells using this setup with plant-based resins.
Other practical tips include:
- Keep resin in sealed bottles when not in use (an empty vat also releases fumes)
- Clean up any spills immediately with absorbent paper
- Always wear nitrile gloves — resin on your skin can smell for hours
- Position your printer near a window where possible
- Schedule long prints for when you're out of the house
Is resin smell dangerous to your health?
Resin fumes contain volatile organic compounds (VOCs) that can cause respiratory irritation, headaches, and allergic sensitisation with prolonged exposure. Even if the smell seems mild, harmful compounds may still be present, so adequate ventilation is always essential.
The main risk isn't the smell itself, but the chemical compounds causing it. Standard resins contain acrylates, which are known irritants and can cause contact dermatitis and respiratory issues. Even "odourless" or low-odour resins still contain photoinitiators and stabilisers that require caution.
Symptoms of excessive exposure include:
- Persistent headaches
- Eye and throat irritation
- Nausea or dizziness
- Skin rashes (from direct contact)
- Development of allergic sensitivity over time
Plant-based and bio-resins, while generally safer, are not completely harmless. The absence of a strong smell can create a false sense of security, but they still require the same basic precautions around ventilation and personal protection.
When should you NOT print resin indoors?
Never print with resin in unventilated spaces, rooms where you sleep, near food, or anywhere children, pets, or people with respiratory conditions are present. It's also unsafe in basements without ventilation or spaces smaller than 8m² without active air extraction.
Specific situations where resin printing indoors is strongly inadvisable:
- Active bedrooms: VOCs accumulate overnight and 8 hours of continuous exposure is dangerous
- Kitchens or dining areas: Fumes can contaminate food and food prep surfaces
- Children's rooms: Kids are more sensitive to chemicals and have lower body mass
- Spaces with small pets: Birds and rodents are especially vulnerable to fumes
- Windowless basements: Fumes are denser than air and accumulate in low areas
- Studios under 85 sq ft: Fume concentration quickly exceeds safe levels
If you live in a small apartment with no option to dedicate a ventilated room, you're better off considering external printing services or switching to FDM. Resin printing requires a dedicated space with proper ventilation — no matter how much "odorless" marketing they throw at you, this is non-negotiable.
Best low-odor resin options (ranked by smell level)
The lowest-odor resins on the market combine plant-based formulations with additives that reduce volatility. The table below ranks the most popular options based on real user feedback and verified technical specs.
| Resin | Odor Level (1-5) | Chemical Base | Shore D Hardness | Price/L approx |
|---|---|---|---|---|
| Anycubic Plant-Based UV | 1.5 | Soy extract | Not specified | $38-45 |
| eSUN eResin-PLA Pro | 2 | PLA starch | 78-80 | $50-55 |
| DR.3D Odorless | 2 | Soy-based plant | 95 | $44-50 |
| Phrozen Aqua 8K | 2.5 | Modified acrylate | 75-82 | $33-38 |
| Generic Water Wash | 3 | Water-soluble acrylate | 76 | $27-33 |
| Standard resin | 4-5 | Acrylate/methacrylate | 80-85 | $22-27 |
The scale runs from 1 (barely noticeable) to 5 (harsh chemical smell). You'll notice the price climbs significantly with lower-odor formulations, but for home use the extra investment is worth it. Shore D hardness stays competitive across most options, except some water-wash resins that trade hardness for easier cleanup.
One important detail: eSUN eResin-PLA Pro, despite its premium price, delivers excellent mechanical properties — 25-28% elongation and impact resistance of 32-36 J/m — outperforming many standard resins that reek.
Frequently asked questions about resin printing odor and safety
Can I use a regular face mask to protect myself from the fumes?
Surgical masks and cloth masks offer no protection against chemical vapors. You need a respirator with activated carbon filters rated A1 or A2 for organic vapors. Even then, proper room ventilation is still essential — the respirator is an extra layer of protection, not the primary solution.
Does the smell go away after UV curing?
Properly cured prints (minimum 5-10 minutes under a 365-405nm UV lamp) significantly reduce odor, but may retain a faint chemical smell for days or even weeks. Incomplete curing is the main reason prints keep smelling indefinitely.
Do expired resins smell worse?
Yes — old or improperly stored resins (exposed to heat or light) can develop stronger odors as the stabilizers break down. Ideal storage temperature is 59-95°F (15-35°C) in a dark location. A resin that smells unusually strong may have already started to degrade.
Can I mix low-odour resins with standard ones?
Technically yes, but you'll lose the low-odour properties. Even a 20% standard resin mix can make the smell almost as strong as using 100% standard resin. If you're looking to cut costs, it's better to alternate resin types depending on the project.
Do HEPA air purifiers remove resin smell?
HEPA filters only capture particles, not chemical vapours. You need a purifier with an activated carbon filter specifically rated for VOCs. Even then, they're less effective than direct outdoor ventilation because they recirculate the air rather than replacing it.
Is it safe to print with "odourless" resin while pregnant?
No type of resin exposure is recommended during pregnancy, regardless of odour level. The chemical components can be teratogenic even without a perceptible smell. If printing is necessary, delegate the task or use an external printing service during this period.
Happy printing, and stay safe out there 😎
🌱 Anycubic Plant Based Eco Resin
The Anycubic Plant Based Eco Resin lets you print without worrying about harsh fumes, thanks to its VOC-free, low-irritant formula. Made with soy-based extracts, it's the perfect choice for clean, eco-friendly 3D printing you can feel good about.