Knowing how to glue 3D prints will come in handy if you carry out projects with 3D printers on a regular basis. A classic example is repairing a broken part. In other cases, you may need to create a part that is larger than your printer can handle. This how-to guide tells you the best ways to glue 3D printed parts together so your projects will turn out nicely.
Whether you need to glue 3D prints because they are broken or want to join smaller pieces to create a larger part, choosing the right adhesive is essential. To minimize the appearance of seams while maximizing their strength, choose an adhesive that bonds well with your materials. If you are gluing flexible 3D prints together, make sure the adhesive you select creates elastic bonds that will move with the material.
Super glues are the best option for gluing 3D prints made of rigid plastic such as ABS, PLA, and PETG. Reach for a product like Loctite Super Glue Liquid Brush On for invisible seams and quick application. If you are working on a detailed project and need more time and greater precision, try Loctite Super Glue Extra Time Control. After applying the latter, you can reposition pieces to guarantee precise bonding and correct mistakes. It's easy-squeeze bottle helps you work with pinpoint accuracy.
Plumber’s cement is a good option for gluing 3D prints made of ABS, PLA, and HIPS, but it’s not compatible with PETG, nylon, and similar filaments.
Epoxies will bond to all materials and even fill small gaps, but they create rigid bonds and are not a good choice for flexible materials. Since epoxies are often formulated for specific applications, make sure they will adhere to your materials before using them.
Gather your materials before you start gluing 3D prints together. You need these items:
cleaning agent(s) required to remove any grease and dirt from your 3D parts
clean rags
sandpaper (if applicable)
adhesive
clamps (if applicable)
proper solvent for cleaning up spills (consult the product’s instructions)
utility knife in case you need to cut away cured adhesive
Remember: Wear any protective equipment mentioned in the product’s instructions, and work in a well-ventilated area.
Before you can attach the 3D printed parts, you need to prepare all surfaces you want to bond.
- Clean the surfaces. Make sure they are close-fitting and free of residue and particles that could prevent the glue from adhering to them.
- Let the surfaces dry.
- Create the proper texture. Some glues adhere better to rough surfaces, while others, like cement glue, require flat/smooth surfaces. Check your product’s instructions and prepare the surfaces accordingly.
Once the surfaces are ready, you can attach the 3D printed parts.
- Prepare the adhesive. If you need to mix your adhesive (as with epoxies) or heat it (when using a glue gun), do so now.
- Apply the adhesive. Follow the product’s instructions, noting how much to apply and whether you need to apply adhesive to one or both surfaces.
- Clamp the surfaces together. Use your hands or clamping devices as appropriate to keep the pieces in place until the bond sets.
- Clean-up. Use a rag and the solvent mentioned in the product’s instructions to clean up any spills or excess glue that has seeped out of the seam before it hardens. You can often cut off cured adhesive using a sharp blade, but it is best to consult the manufacturer’s instructions before proceeding.