What are the three main types of glue for 3D printed parts?
The three main adhesives for 3D printed parts are cyanoacrylate (super glue), two-part epoxy, and glues/solvents (PVA, hobby glue, or solvent-based). Cyanoacrylate bonds the fastest, epoxy provides the strongest hold for functional parts, and glues and solvents work best for specific materials and use cases.
When a part is too large to print in one piece, or you want to assemble a multi-color model, the question shifts from how you print it to how you glue it. Prusa's guide sums it up well: they focus on three main adhesive types they consider the most viable options — primarily cyanoacrylate glues, followed by solvent-based glues, and two-part epoxy glues.
Each type has its own logic. Cyanoacrylate cures in seconds but leaves a brittle bond; epoxy takes longer but handles load-bearing applications; solvents and specialty glues fuse or fill depending on the plastic. Before buying anything, think about the part itself: is it decorative or structural? Will it take impacts or vibration? That answer matters more than the brand. Our store carries a curated selection of adhesives and glues for 3D printing designed to cover all three needs — no improvising with whatever's in the junk drawer.
When should you use cyanoacrylate (super glue) on 3D printed parts?
Cyanoacrylate is ideal for small joints, quick repairs, and models that won't take mechanical stress — it bonds in seconds and applies directly. It's not the best choice for parts under tension or impact, as the joint tends to be brittle. For decorative prints, miniatures, and prototypes, it's the most practical option.
Super glue is the most versatile and widely used adhesive for joining 3D printed parts. Its fast-bonding process makes assembly quick and delivers a reasonably strong hold. For small parts and detailed models, it's almost always the first tool I reach for.
A couple of tips that make a real difference:
- Use gel formula instead of liquid when the surface isn't perfectly flat. Gel prevents the adhesive from wicking into the print layers, keeping enough product on the contact surface to create a lasting bond.
- Consider an activator (accelerator) for larger assemblies. It's a spray that cures cyanoacrylate in seconds when applied to the joint, so you don't have to hold parts together while they set.
- For tiny parts, precision tips on the bottle give you a finer applicator and much better control.
Cyanoacrylate gets you out of almost every everyday bind. Where it fails is when you expect it to hold up somewhere it was never designed to.
When to use two-part epoxy
Two-part epoxy is the strongest option for functional, load-bearing, or large-format parts. You mix a resin with a hardener, and once cured, it forms an extremely durable bond that resists heat and chemicals — compatible with almost any 3D printing material. The trade-off is longer cure time.
When the question is which adhesive gives the strongest long-term bond, there's really no debate. For durability, two-part epoxy is the clear winner — and for functional parts that need to handle mechanical stress, it creates a far more resilient bond than any CA glue. That makes it the go-to choice for large assemblies or structural parts.
The other major advantage is versatility. Epoxy works on virtually every 3D printing filament material, including PLA, PETG, ABS, ASA, nylon, PC, and more. And if the part is going outdoors, epoxy is highly durable and waterproof — making it a solid choice for bonding 3D printed parts meant for exterior use.
The trade-off is patience. Cure times vary; most epoxies need 24–72 hours at room temperature to reach full strength, while CA glue achieves handling strength in seconds but remains more brittle. Fast-cure epoxies — around 10 minutes to set — are a convenient middle ground when you don't want to wait a full day, though full strength still takes longer.
A practical tip: mix epoxy in small batches and use it right away. If you mix a large amount and then take your time, it'll harden in the cup before you've bonded anything — leaving you with a solid block of useless resin. Two small mixes are always better than one large one that kicks halfway through.
When to use PVA glue or hobby adhesive
PVA (white glue) and hobby adhesives are best suited for low-stress bonds, temporary assemblies, or situations where you need a more forgiving, repositionable joint. They can't match the strength of epoxy or the speed of CA glue, but they fill gaps well and clean up easily — making them a natural fit for scale models and decorative pieces.
They may not steal the spotlight, but they have their place. For most printed plastics, a multi-surface adhesive like Aleene's — available at any craft store — offers a more forgiving bond that's easier to work with. For something stiffer, dedicated hobby adhesives produce a harder, more rigid joint.
This category also includes specialized 3D printing adhesives, which deserve a mention for their convenience. These products fill a niche role, offering precision application for specific use cases — though they often come at a higher price point. The most well-known example is the 3D Gloop family, formulated to slightly melt and fuse the plastic together. It comes in three versions, each designed for a specific material: PLA, ABS, and PET (which also works with PETG parts). If you work extensively with one particular filament, it's worth the investment.
Which glue works best on resin vs PLA vs PETG?
For PLA, cyanoacrylate is the top choice for speed and bond strength. For resin prints, CA glue works well for small joints and miniatures, while epoxy delivers structural strength. For PETG, cyanoacrylate struggles due to its chemical surface, so many makers turn to epoxy, super glue with activator, or specific solvents.
The material makes all the difference. With PLA, it's straightforward: super glue is the best adhesive for bonding PLA parts — it sets fast and creates a strong, lasting bond. If you're printing with 3D printing filaments like PLA or PLA+, gel cyanoacrylate handles almost any situation.
PETG is a different story. Its chemical composition makes it a poor match for standard CA glue — it's not that it never works, but it takes more effort. Super glue, Gorilla Glue, silicone adhesive, and epoxy resin all perform reasonably well with PETG. Here's a useful trick for PETG and super glue: unlike PLA, you need to hold the parts together much longer. It also helps to apply a thin coat, let it dry, and reapply before pressing the pieces together. Don't expect the instant grab you get with PLA.
For SLA/MSLA resin prints, the approach is different again. Cyanoacrylate is the go-to for fast assembly of small contact areas — especially when joining tiny pieces on miniatures or repairing fine broken details. But be careful about improvising with solvents: a poorly chosen adhesive, like plastic cement designed for polystyrene, may seem to hold at first but fails quickly because it can't chemically dissolve or fuse UV-cured resin. If you're working with different 3D printer resins, combining CA glue for detail work and epoxy for structural joints covers virtually any assembly need.
When should you NOT use cyanoacrylate on 3D printed parts?
Avoid cyanoacrylate on load-bearing or impact-prone parts, on flexible filaments like TPU without a specific formula, and whenever aesthetics matter on parts that may experience glue whitening. CA glue bonds are brittle and handle mechanical stress poorly. For those situations, epoxy or solvent welding deliver better results.
The biggest limitation of super glue is brittleness. Cyanoacrylate is excellent for quick fixes but lacks the durability needed for parts under stress. If a part is going to take impacts, leverage, or continuous vibration, the joint will eventually fail — no matter how fast it bonded initially.
Cases where I'd rule out cyanoacrylate from the start:
- Flexible filaments. Standard super glue doesn't bond well with TPU or nylon — you'll need a flexible-specific formula or switch to polyurethane adhesive.
- Large load-bearing parts. Epoxy is the clear winner here, no question.
- Delicate visible finishes. CA glue bonds beautifully, but after a few days it can leave a white haze around the joint on some parts. This is the classic cyanoacrylate "blooming" effect, and on a visible finish it's very noticeable.
For ABS and ASA, there's also an alternative that beats almost everything else: while super glue is the best adhesive for PLA and PETG, solvent welding is the top choice for ABS. The solvent melts both surfaces and fuses them into a single piece — something no surface adhesive can achieve.
Comparison table: adhesive type by material and application
Each cell reflects the general recommendation based on available sources; where results vary significantly by product, this is noted.
| Adhesive | Best for | PLA | PETG | Resin | Cure time |
|---|---|---|---|---|---|
| Cyanoacrylate (CA) | Small joints, miniatures, repairs | Excellent | Requires care / activator | Good for fine detail | Seconds (brittle) |
| 2-part epoxy | Functional parts, large assemblies, outdoor use | Excellent | Good | Good (structural) | 10 min to 24–72 h |
| PVA / hobby glue | Temporary assembly, model kits | Acceptable | Acceptable | Not specified | Hours (forgiving) |
| Solvent (DCM/acetone) | Structural ABS welding, true fusion bonds | Works (DCM) | Works (DCM/PVC primer) | Not recommended | 24 h with clamping |
| Specialty glue (e.g. 3D Gloop) | Cosplay, large same-material assemblies | Yes (PLA version) | Yes (PET version) | Not specified | Fast |
A safety note on solvents: paint strippers containing methylene chloride (dichloromethane) can solvent-weld both PLA and PETG. It's highly effective but also toxic — proper ventilation and gloves are absolutely required.
How to prep surfaces before gluing
For a strong bond: clean both surfaces with isopropyl alcohol to remove grease and dust, sand lightly for better grip, wipe away loose particles, apply a thin even coat of adhesive, and clamp for the time specified by the manufacturer. Surface prep matters just as much as choosing the right glue.
The step most people skip is cleaning. Before applying any adhesive, proper surface preparation is critical for a strong bond. The process recommended at lava3dp for gel CA is straightforward: clean both mating surfaces with isopropyl alcohol to remove fingerprint oils, apply a thin even layer of gel to one side, mist a light spray of activator onto the opposite surface, and press firmly together for ten seconds.
For epoxy and difficult filaments, sanding adds real mechanical grip. It's a good idea to lightly sand both surfaces before bonding — this increases surface area and produces a stronger, longer-lasting joint. After sanding, don't skip the next step: wipe away any loose plastic particles by cleaning the surface with a dry cloth.
Then, clamp it. Clamping isn't optional when you need a strong bond: it stabilizes the joint far better than a steady hand and prevents slipping while the adhesive cures. A tip from the Prusa forums for CA glue and parts that don't fit perfectly: always dry-fit before gluing, because cyanoacrylate can bond too fast to fix mistakes. Here's the truth: 90% of failed bonds come down to not cleaning the surfaces and not clamping — not the adhesive itself. A good fit, clean surfaces, and a clamp, and almost any of these adhesives will perform at its best.
Frequently Asked Questions
Can super glue be used on load-bearing parts?
It's not ideal. Cyanoacrylate cures fast, but the bond is brittle and doesn't hold up well under sustained mechanical stress. For load-bearing, articulated, or impact-prone parts, two-part epoxy delivers a far more durable bond. Save CA glue for detail work, miniatures, and non-structural repairs.
Why does my CA-glued part have a white haze around the joint?
That's "blooming" — a well-known cyanoacrylate side effect. Over time, CA can leave a whitish haze around the joint on some parts, and it's especially noticeable on dark or glossy surfaces. For visible or display-quality finishes, use a low-bloom CA, apply it sparingly, or switch to epoxy.
What's the strongest bond for 3D printed parts?
For long-term strength, two-part epoxy wins on parts under tension. With ABS and ASA, solvent welding (dichloromethane or acetone) goes even further by fusing both surfaces into a single piece, eliminating the joint as a weak point entirely.
How do I remove excess super glue from a 3D print?
Some people use baby oil to soften dried cyanoacrylate, as it seeps between the plastic and the adhesive. Acetone also dissolves CA, but it attacks PLA and other plastics — test it on a hidden area first, or avoid it altogether on finished parts.
Is epoxy suitable for outdoor parts?
Yes, it's the best choice for outdoor use. Cured epoxy resin is waterproof, temperature-resistant, and chemical-resistant, maintaining its bond where cyanoacrylate would break down under moisture and thermal cycling. It's the go-to for outdoor brackets, enclosures, and functional parts.
Patience and a steady hand 💪 😎
Gomagom 9 Super Glue 10g | Precision Cyanoacrylate for 3D Printing
If the comparison guide has sold you on cyanoacrylate, the Gomagom 9 is the one you'll want in your workshop: its built-in brush applicator lets you place exactly the right amount of glue — no drips, no mess. Perfect for those tight joints where a standard nozzle would ruin everything.