What are the best adhesives to glue Pro PCTG 3D printed parts together?

3D printed your part in Pro PCTG, and now you need to join multiple pieces into a single finished model? We tested several common adhesives on 3D-printed 3D-Fuel Pro PCTG to see which works best - both for large bonding surfaces and for thin parts that flex or twist.

TL;DR - Best Adhesive for Pro PCTG (Quick Recommendations)

• Best overall strength (most reliable): Epoxy

• Fast + easy for large rigid parts: Super glue (CA / cyanoacrylate)

• “Plastic weld” style bonding: PETG 3D-Gloop!

• Not recommended (in our testing): E6000

What We Tested (and How)

We tested the following adhesives on 3D printed Pro PCTG:

• E6000

• Epoxy

• Super glue (Cyanoacrylate / CA)

• PETG 3D-Gloop!

Test method:
We printed a cylinder with a flared base to increase bonding surface area, applied each adhesive, clamped the parts, and allowed them to cure for 24 hours at room temperature.

Note: This was a practical shop test (not a lab tensile test), intended to compare real-world results.

Results Summary

After curing:

• Epoxy, super glue (CA), and PETG 3D-Gloop! held strongly and could not be pulled or twisted apart by hand

• E6000 was the only adhesive we tested that could be separated by hand after curing

For large surface-area bonds, epoxy, CA glue, and PETG 3D-Gloop! all performed well.

Best Practices (Important!)

No matter which adhesive you choose, these steps will dramatically improve your results:

1. Dry fit first (tight fit = stronger bond)

2. Scuff/sand both faces (120–220 grit is a great range)

3. Clean with isopropyl alcohol (IPA) and let it dry completely

4. Clamp firmly and evenly

5. Allow a full cure (24 hours recommended whenever possible)

Tip: Joint design matters. Alignment pins, keyed connectors, dovetails, and other interlocking features can massively increase strength - especially on large prints.

Adhesive Comparison for Pro PCTG (Pros / Cons)

Epoxy (Best Overall Strength)

Best for: Strong bonds, functional parts, thin parts, parts under load, cosplay props, “this must not fail” projects

Epoxy is typically the strongest and most reliable adhesive option for bonding PCTG, especially when the surfaces are lightly scuffed first. It also handles small gaps better than super glue.

Pros

• Excellent strength and durability

• Works well even with slight gaps or imperfect surfaces

• Great for parts that see stress, impact, twisting, or vibration

Cons

• Requires mixing and can be messy

• Needs clamping and cure time for best results

5-minute epoxy vs slow-set epoxy

• 5-minute epoxy is great when you need fast handling strength

• Slower-set epoxies often achieve a stronger final bond and give you more time to align parts

Even if the joint sets quickly, it’s still best to wait 24 hours for full strength.

Super Glue (CA / Cyanoacrylate) (Fast + Easy)

Best for: Large models broken into sections, clean joints with good surface contact, quick assembly

Super glue works very well on Pro PCTG when the joint fits tightly and has a good contact area. It cures hard, so it’s excellent for rigid assemblies - but not ideal for flexible joints.

Pros

• Very fast cure time

• Easy to apply

• Great for tight-fitting parts with large contact surfaces

Cons

• Can crack under bending or twisting

• Not ideal for thin parts or flexible sections

• Less forgiving of gaps

Tip for better results:
For large models cut into multiple pieces, add alignment connectors/pins (many slicers support this during the cut). This increases surface area and helps prevent the joint from shifting under stress.

PETG 3D-Gloop! (“Plastic Weld” Style Bonding)

Best for: Strong bonding with a welded feel, joints you can clamp tightly, clean flat contact surfaces

PETG 3D-Gloop! behaves more like a solvent weld than a traditional glue. It softens the faces and fuses them together—similar to how PVC cement works.

In our testing, it performed better than super glue when parts experienced twisting or deflection when clamped properly.

Pros

• Creates a fused/welded-style bond

• Can outperform super glue in high-stress joints

• Excellent when parts fit well and clamp evenly

Cons

• Higher cost than CA glue or epoxy

• Requires good fit-up and clamping for best results

Price + shelf life considerations:
As of January 2026, a 120 mL jar of PETG 3D-Gloop! costs $34.99, and it advertises a shelf life of 90 days after first opening. If you only glue occasionally, epoxy or CA may be a better value.

E6000 (Not Recommended for PCTG)

Best for: Not recommended for PCTG bonding based on our testing

E6000 was the only adhesive we tested that did not bond PCTG reliably in our cure-and-clamp test. After 24 hours of cure time, the parts could still be separated by hand.

Choosing the Right Adhesive (Simple Decision Guide)

• Choose Epoxy if you want the strongest bond and the most reliable results

• Choose Super Glue (CA) if you want fast assembly for rigid parts with good surface contact

• Choose PETG 3D-Gloop! if you want a welded-style bond and can clamp properly

• Avoid E6000 for PCTG bonding (based on our testing)

Safety Note

Always follow the adhesive manufacturer’s directions, and use adhesives in a well-ventilated area.