What is the Best Glue for 3D Printing Bonds? PLA, ABS, PETG


3D prints can get detached and broken sometimes, so you want to find a way to stick it back together. This leads many people to wonder whether superglue works on PLA and other 3D printing materials, so I decided to look into it.

There are so many options that you can use for gluing 3D prints together and they differ across material types. This article should simplify the process and make it easier for you to choose a solid option that you can stick with.

Keep on reading through this article for some more information about getting the best glue for your 3D prints once and for all.

What is the Best Glue for 3D Printing Bonds?

The best glue for 3D printing is superglue because it provides a strong bond between plastic and is very easy to use. A good brand of superglue cures quickly, so for materials like PLA, ABS, and PETG, it should work great. It doesn’t work so well for flexible filament like TPU or Nylon.

There are other options out there that several 3D printer users have success with, but superglue is the most recommended.

Make sure you are in a ventilated place and are wearing a protective mask and goggles when using some of these adhesives. They can be fairly irritating to your breathing and skin if you come into contact with it.

If you want to get some good quality superglue for your 3D prints, I’d recommend getting yourself some Gorilla Super Glue (20 Grams) from Amazon.

This one does take some extra time to cure, so you can use a separate activator like baking soda to speed up the curing process. Other people have said even water works well to achieve this, although it’s going to run as you would expect.

You can also go with the Bob Smith Industries BSI Maxi Cure Clear Adhesive from Amazon. It comes as a combination pack of the superglue and an accelerator to cure in just 10-25 seconds.

It states that it can bond metal, plastic, wood, ceramics, rubber, leather and more.

A further read into this article will give you an insight into things you can use in gluing your 3D print.

What is the Best Glue for PLA?

The best glue for PLA 3D prints is superglue. Other popular options are 2-part epoxy resins that are mixed together to activate then cures together to bond two objects. A specialized glue that works very well for PLA is PLA Gloop. It bonds PLA 3D prints together strongly, but can also be used as a bed adhesive.

Superglue has a short time for curing and it forms just a thin layer of bonding that is mostly not visible to the eyes when done carefully. One user said you can remove excess superglue with baby oil as it penetrates the bond between the plastic and the superglue itself.

Other adhesives that join PLA are:

  • Epoxy Resin
  • 3D Gloop
  • Contact Cement
  • Hot Glue Gun
  • Acetone
  • Soldering Iron
  • 3D Printing Pen

Epoxy Resin

Epoxy resin is a popular solution to gluing and combining up 3D prints, especially for rigid materials like PLA. It does take longer to cure than superglue though, taking around 5 minutes to set, and another 10-15 minutes to fully cure.

The difference is the level of strength that you get with the right kind of epoxy resin.

It’s a great solution to joining up those larger 3D prints like cosplay items and other similar items. You’ll get the best results with an epoxy resin by clamping it down during the curing process.

I’d recommend going with the Loctite Epoxy Instant Mix from Amazon for your 3D printing needs if you go with this option.

3D Gloop

3D Gloop is a great alternative to superglue and may even be a better product for bonding/gluing PLA 3D prints together. It is known to be a solvent which actually slightly melts the PLA plastic and weld it together.

In the video below by MatterHackers, you can see just how well this product works to stick PLA together. It also can be used as a bed adhesive to help 3D prints stick to the bed while printing.

Contact Cement

Contact cement is also great at bonding PLA, though some people have complained about the visibility of the adhesive after using it. With practice, you should be able to apply is carefully and smoothly to not show up very much.

You can also sand any areas which show the contact cement on your PLA prints with 120 grit sandpaper.

A popular one that I found on Amazon is the Permatex Contact Cement 1.5 oz. It’s known to be great for instant bonding applications, is heat and water resistant, and can even bond rubber to glass and metal.

They mention that no clamping is required for this product to work well.

 

Hot Glue Gun

You can’t go wrong with a hot glue gun when it comes to gluing plastics, being a very popular solution for many applications. It has pretty good strength and isn’t too difficult to apply, with a 45-second application time.

When you do use this though, the glue tends to be fairly thick, so it would be better for larger 3D prints and big projects like cosplay armor. For something like miniatures or smaller 3D prints, I wouldn’t recommend using a hot glue gun.

I’d recommend going with the Gorilla Dual Temp Mini Hot Glue Gun Kit with 30 Hot Glue Sticks from Amazon.

  • It has a precision nozzle that makes operation a lot easier
  • An easy-squeeze trigger
  • Weather-resistant hot glue sticks so you can use it in or outdoors
  • 45-second working time and withstands strong impacts
  • Has an insulated nozzle that prevents burns
  • It also has an integrated stand to keep the nozzle off other surfaces

Acetone

This has been known to weld and smooth PLA but only with certain types, most likely based on the manufacturing methods and chemical properties. Thomas Sanladerer shows us this in the video below.

You can get yourself a bottle of Pure Acetone from Amazon for a pretty good price.

Soldering Iron

Another method of “gluing” PLA together consists of using a soldering iron to apply enough heat to melt the PLA part, then hold it together so it hardens and joins. It’s obviously not a glue, but it works very well to bond PLA parts together.

You can also use a line of the same filament you used to print the object, then solder that into both the 3D printed plastic parts to weld it together as shown in the video below.

The basic instructions of  this video are to:

  • Get your 3D printed pieces and make sure the surface is good enough to  together
  • Get your soldering iron and set it to a temperature around 200°C
  • Use a length of the PLA filament you used for printing
  • Line up the length of filament with the 3D print and melt the filament to use as a solder to combine the pieces together. You want to filament to actually get into the gaps and holes
  • Let the PLA cool down and it should be joined together strongly.

A great one that should work well for the purpose of joining PLA together is the Anbes 60W Soldering Iron Kit from Amazon.

Here is another video which shows you how to weld together two parts. It was from a 3D print that failed halfway, which he split up and managed to print the other half and then combine it with soldering.

3D Printing Pen

A lesser known solution for gluing or joining PLA 3D printed parts together is to use a 3D printing pen. It’s not as popular since it isn’t as effective as the other solutions, but it definitely has its uses for 3D printing.

It’s similar to the soldering iron in a way, but uses the heat from a 3D printing pen to join PLA plastic parts together.

The MYNT3D Professional Printing 3D Pen from Amazon is a great choice.

One user did mention how they used this specific 3D printing pen to weld pieces of prototype parts together since they were too big to print in one part.

You can get better results with “gluing” pieces together by applying heat from a hair dryer or heat gun. It’s a pretty quick solution since you don’t have to hold things for long periods of time to set.

You should try to use fairly high temperatures to achieve this as compared to what you would usually set, though heat controls for this 3D printing pen is really simple.

It can also be used to fix small imperfections and gaps in your other 3D prints which is very practical.

What is the Best Glue for ABS?

A popular product to glue ABS 3D prints is acetone because it is a solvent which can actually dissolve ABS then harden up again. When you apply acetone to both ABS parts then hold it together, the softened part will start to form a strong bond until it cures fully. This process is called solvent bonding.

Other great glues or adhesives you can use for ABS are:

  • Superglue
  • ABS Juice, Glue, Slurry
  • Epoxy
  • Polyurethane
  • Hot Glue Gun

Superglue

As previously mentioned, superglue is great for rigid objects and plastics. You can apply some superglue to your ABS 3D print and have it glue together fairly quickly.

You want to ensure that your objects are aligned nicely before you apply the superglue though because once it cures, you won’t be able to realign it nicely.

ABS Juice, Glue, Slurry

Another great set of products is ABS juice, glue and slurry, which are very similar in characteristics but mainly differ in thickness. You mainly want to use ABS slurry which is the thickest of the three to repair ABS prints and help with gluing pieces together.

It’s also used as a way to repair layer separation.

Epoxy

Epoxies are a great method for bonding and gluing ABS plastic 3D prints.

One advantage of epoxies is that they are water and chemical resistant, making them a suitable choice for high-strength bonding. It requires no heat to cure, although if you want an accelerated result, you can apply heat.

Again, I’d go with the Loctite Epoxy Instant Mix from Amazon.

Hot Glue Gun

This is another fast way of gluing your ABS together. Simply load some filaments into the gun and use the heated extrusion to join the parts. It can also fill gaps. Ensure not to move the nozzle too close to the ABS to avoid melting.

Surface Preparation: It is important to prepare the surfaces of the ABS parts you want to glue by cleaning, degreasing, and sanding.

Caution: The precautionary measure against the dangers that can arise from using acetone is keeping it away from flame because it is highly inflammable. Also, use it in a ventilated space to avoid excessive inhalation.

What is the Best Glue for PETG?

The best glue for PETG is superglue since it holds the parts together strongly and still maintains the quality and integrity of the 3D print.

You won’t need to bother about clamping the parts together as it pretty quickly bonds together and cures fast. Loctite glue and gorilla glue is some of the best.

Other adhesives that can glue PETG are:

  • Two-Part Epoxy
  • Hot Glue Gun
  • Solder Iron

Two-Part Epoxy

A two-part epoxy is pretty popular with 3D printer users to glue PETG parts together. They usually come with another container in the pack called the hardener or accelerator.

The two products are meant to be mixed together before applying it to the surface of the PETG.

Although, the curing time varies; some take 5 minutes, while some take more time. The combination of a hardener and the glue itself will make a long-lasting and strong bond between the parts.

Hot Glue Gun

Most of the tests that were carried out on PETG using a hot glue gun prove its ability to bond two PETG permanently.

Check out this video on YouTube where a series of tests were carried out on different adhesives and the hot glue gun was confirmed to be one of the most reliable.

Again, I’d recommend going with the Gorilla Dual Temp Mini Hot Glue Gun Kit with 30 Hot Glue Sticks from Amazon.

Soldering Iron

A soldering iron with a temperature control option can glue PETG parts when used in melting the surfaces of the print. This process requires patience and it will yield good results in the end.

Ensure to wear a protective mask and goggle when using any of these adhesives. Use it in a ventilated area.

It works in the same way that it would with PLA, so you can watch the video in that section to see how you would do this with PETG.

What is the Best Glue for TPU?

The best glue for TPU is flexible superglue like Loctite 406 Superglue. It is designed in a way that allows it to bond rubber and flexible materials together with ease. The bonding and curing times of this glue is very quick and provides a strong bond which can’t easily be broken.

Other glues that work well with TPU are:

  • Flexible Superglue
  • DMF (N-Dimethylformamide)
  • THF (Tetrahydrofuran)
  • Soldering Iron

Flexible Superglue

A tried and tested product that works great to glue TPU 3D prints is the Genuine Loctite 406 Superglue Instant Adhesive from Amazon.

It has the following features:

  • Rapid bonding with plastic and flexible materials
  • Great adhesion of materials that are hard to bond
  • Multi-purpose and works in many applications
  • Very easy to use

It does have a pretty small margin of error, so you want to be very quick and accurate when using this stuff. It has an early bond strength said by users to be in just seconds, showing just how strong it is.

One user even bonded a broken rubber roller belt with this product. It’s best used to join TPU with another type of material like PLA. For TPU to TPU, it can still work well, but the solvents below are more efficient.

DMF (N-Dimethylformamide)

DMF is a solvent that can melt your two pieces of TPU or flexible filament together. When it comes to joining up TPU with another TPU 3D printed part, using a solvent is usually the best solution.

THF (Tetrahydrofuran)

THF is another pretty strong solvent which dissolves TPU and allows you to bond two separate TPU prints by applying it on the surface and holding it together.

Soldering Iron

Similar to using a soldering iron for PLA and other materials, it can also be used for TPU and flexible 3D prints.

In the video below, he uses a soldering iron with a flat mouth to create a specific space for the TPU to be bonded together. He then filled it up with TPU filament and heated it up to let the parts soften and bond together.

After the TPU parts harden, it should create a very strong bond that can’t easily be pulled apart, unless the soldering wasn’t done accurately.

 

What is the Best Glue for Nylon?

The best glue for Nylon is a hot glue gun. Superglue doesn’t work as well with Nylon unless you have a flexible superglue. Many people have gotten great results when gluing Nylon with a hot glue gun. You can choose a method of heat like a soldering iron to bond Nylon 3D prints together.

Other methods you can adhere nylons are:

  • Hot Glue Gun
  • Soldering Iron
  • 3D Printing Pen

You may think epoxy and superglue can work well on Nylon but it doesn’t have the same effect, mainly because of the flexibility and composition. You could do well with some of the flexible superglues mentioned in the TPU section above.

I’d recommend going with the hot glue gun or the soldering iron option. Another great method for “gluing” Nylon together would be a friction welding method which works with a rotary tool to heat up the surface and bond it together with friction.

It actually works pretty well for all sorts of materials, though you’ll want to keep safety in mind due to the dust and fumes it can cause. Some people even recommend combining the hot glue gun and friction welding method for even better results.

Another technique which isn’t talked about a lot of friction welding. You don’t need any kind of adhesive, but you do need a special tool to get this method working properly.

A Dremel Lite 7760 Cordless Rotary Tool from Amazon is a great product to use for friction welding.

Can You Use Superglue on PLA? What To Do If It Doesn’t Work

You can use superglue on PLA as a way to join parts together. It’s one of the best options for bonding PLA 3D prints, especially for smaller parts.

In some cases where superglue doesn’t work on PLA, it could be because:

  • There are too many cavities or gaps where the parts are supposed to join together
  • There was the presence of moisture or water on the surface which inhibits bonding
  • The quality of your superglue isn’t at its best
  • The PLA is exposed to heat which might break the bonding

If it doesn’t work, I’d recommend sanding the surface of both PLA parts to ensure a better fit. You want to use fairly low grit sandpaper like 120 grit to really prepare the surface to be glued together.

You also want to get another brand of superglue that cures faster and has better bonding properties, especially if your superglue is not very effective.

Does Contact Cement Work on PLA?

Yes, contact cement does work on PLA to glue 3D printed pieces together. It usually has a strong bond and also leaves you room for correction unlike with superglue.

Contact cement dissolves the surface of the PLA when applied and this process aids the bonding. A 3D enthusiast agreed with the fact that contact cement works on PLA, but you do need to use a good, reliable product that is known to work with your material.

When you follow the instructions of the specific contact cement you have, you should be able to have success in joining your parts together.

Best Glue for 3D Printed Miniatures (Minis)

The best glue for 3D printed miniatures is standard superglue (Cyanoacrylate). It provides a strong bond for your 3D prints and cures pretty quickly. You’ll usually have to hold the piece on the model for it to set, but you can use an activator to speed up the curing process. 

Accessibility is easy as compared to some solvents, it is very effective and easy to use, as well as being really cheap and long-lasting.

Other adhesives like epoxy work too, but they tend to have a longer curing time. There are definitely some quick-curing epoxies that you can make use of for minis, which many people have had success with.

Contact cement glue is another good option for plastic minis. They bond quickly too (although not as quick as glue) through melting and subsequent fusion. This bond is lasting and more durable than CA.

I wouldn’t use contact cement for very small minis because of the noticeable damage the corrosion will do to the parts.

How Do You Connect & Join PLA Filament Together?

It’s possible to connect and join two pieces of filament or even rolls of filament using a piece of a PTFE tube and a lighter. This is great for when you have small strands of filament left over from spools, which you can join end-to-end.

The method consists of pushing through the filament through the tube, lighting one end with a lighter so it’s softened, pulled it back through the PTFE tube and pushing the second piece of filament in the tube so it can then join together and harden.

The video below shows how it’s done very clearly.

On a final note, if you have followed the instructions above in terms of avoiding certain adhesives for certain materials (like superglue for nylons), you should be good to go by sticking to the recommended ones.

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