PETG 3D printing is robust, tough and gaining popularity in fused deposition modeling. But layer lines, flaws, and coarse textures tend to require post-processing. One of the most effective methods to smooth PETG, PLA and other similar filaments is vapor smoothing, which provides your 3D print models with a glossy finish, improved appearance, and closed outside coating.

PLA and PETG Smoothing Experiment

Surface smoothing of PLA and PETG has been an important technique in the current 3D printing to improve the quality of surfaces. The outermost layer of the plastic gets softened and levels itself through special exposure to the chemical vapour, and the imperfections and layer lines are removed.

We have demonstrated in our experiments that PETG filament is receptive to MEK, ethyl acetate, and dichloromethane vapors, which makes its surfaces perfectly smooth. Vapor smoothing methods in comparison with sanding and polishing methods do not deform the dimensions and lessen the possibility of mechanical properties destruction thereby it is the best post-processing method of a professional quality print.

What Is the Purpose of Vapor Smoothing PETG in Manufacturing?

The main purposes of vapor smoothing PETG include:

• Smooth Surface: Removes layer lines and coarse surfaces.
• Glossy Finish: Fabricates slick and polished surfaces which could be displayed or used in commerce.
• Sealed Outer Layer: Increases strength and waterproofing.
• Better Layer Adhesion: Marginally reinforced 3D printed components.
• Efficient Post-Processing: Saves time as manual sanding and polishing is reduced.

This technique is especially useful for PETG prints, which are strong but naturally harder to smooth chemically than ABS or PLA.

How Does Vapor Smoothing PETG Work?

PETG vapor smoothing is a chemical post-processing method involving the following steps:

• Solvent Selection: PETG requires MEK, ethyl acetate, or dichloromethane, as it resists acetone.
• Vapor Exposure: Solvent is evaporated in a container and vapours are used to soften outer coating of the printed part.
• Solvency of Layer Lines: The surface is softened and the lines merge, ironing flaws out.
• Evaporation & Curing: The solvent evaporates and we are left with a smooth and glossy finish.

Adequately conducted vapor smoothing enhances aesthetics on the surface and preserves the mechanical properties and dimensional accuracy.

How Vapor Smoothing Works

The process works because solvent vapors temporarily soften the outer layer of the plastic without melting it completely. This allows:

• Layer lines and imperfections disappear.
• Smooth surface formation on complex geometries.
• Glossy finish without heavy manual sanding.

Using brush and spray smoothing can target specific areas, ideal for delicate prints where full vapor baths may compromise dimensional accuracy.

Brush and Spray Smoothing

Brush and spray techniques are alternatives for intricate 3D printed parts. Benefits include:

• Targeted smoothing of hard-to-reach areas.
• Controlled solvent application to prevent warping.
• Works with heat guns or sanding/polishing for finishing.

This approach complements full vapor smoothing processes for highly detailed prints.

What Are Examples of Vapor Smoothing PETG Products?

Vapor-smoothed PETG is widely used in:

• Consumer products: Custom cases and enclosures.
• Prototypes: For product development with a polished finish.
• Decorative items: Require smooth and shiny surfaces.
• Mechanical parts: Reduce friction and improve fit.
• Resin-filled PETG prints: Better adhesion due to smooth outer layers.

Vapor smoothing PETG improves both functional and aesthetic value, making it an essential tool for manufacturing and post-processing.

The Best Methods for PETG Filament Smoothing

Effective PETG smoothing techniques include:

• MEK or ethyl acetate vapors in well-ventilated containers.
• Dichloromethane or tetrahydrofuran for resistant prints.
• Targeted brush or spray smoothing for intricate shapes.
• Heat gun post-curing for minor surface adjustments.

Each method requires protective equipment, safety precautions, and careful handling to avoid overexposure, which could warp 3D printed parts.

In-Depth Process for Vapor Smoothing 3D Prints with Each Chemical

Solvent	Suitable Filament	Exposure Method	Result	Safety Notes
MEK	PETG	Vapor container	Smooth and glossy	Respirator, gloves, well-ventilated area
Ethyl Acetate	PETG, PLA	Vapor bath/brush	Glossy, minor softening	PPE, ventilated workspace
Dichloromethane	PETG	Controlled vapor	Perfectly smooth	Highly hazardous, PPE mandatory
Acetone	ABS, ASA	Vapor bath	Layer line elimination, glossy	Flammable, ventilated space
Tetrahydrofuran	PLA, PETG	Vapor exposure	Smooth outer layer	Hazardous, PPE mandatory

Tips for Best Results:

• Gradually soften the outer layer.
• Avoid overexposure to maintain dimensional accuracy.
• Use a heat gun or epoxy resin for final polishing and glossy finish.

Conclusion

Post-processing can also highly benefit you with the use of vapor smoothing PETG which can take your 3D printed components to the next level of professionalism. It enhances the smoothness, glossiness and functionality of the surface whether of prototypes, consumer goods or industrial components.

The most important things to be considered regarding the success are the correct solvents used, safety precautions, and dimensional accuracy in the process of smoothing. Vapor smoothing can be applied to your PETG 3D prints with great care to make a significant improvement to the final quality.

常见问题

How do you make PETG smooth?

Use MEK, ethyl acetate, or dichloromethane for vapor smoothing PETG. The vapor exposure process softens the surface to eliminate layer lines and create a glossy finish.

What is vapor smoothing?

Vapor smoothing is a post-processing technique where solvent vapors dissolve the outer layer of a 3D print, allowing it to self-level and smooth out imperfections.

Can I use acetone to smooth PETG?

No, acetone doesn’t work well with PETG filament. Use MEK, ethyl acetate, or dichloromethane instead for effective results.

Can you heat treat PETG?

Yes, PETG can be heat treated, though it requires precise temperature control. Heat treatment can improve surface smoothness but doesn’t replace vapor smoothing.

Can I vapor smooth PETG?

Yes, PETG filament can be vapor smoothed using the right solvents like MEK or ethyl acetate. The technique creates a smooth surface without compromising dimensional accuracy.

Can you vapor smooth PETG?

Yes, vapor smoothing PETG is effective and works by softening the outer layer through controlled solvent vapor exposure, resulting in a glossy finish and smooth surface.

How to Vapor Smooth 3D Prints?

Vapor smoothing 3D prints involve exposing the print to solvent vapors to soften and dissolve the outer layer. This results in a smooth, glossy surface with no layer lines.

But what about FFF 3D prints?

Vapor smoothing is a great solution for FFF 3D prints, especially with PETG and PLA filaments that have rough surfaces after printing.

Does Vapor Smoothing Affect PETG Part Surface Smoothness and Uniformity?

Yes, vapor smoothing eliminates imperfections and layer lines, making the surface smooth and uniform, improving both aesthetic quality and functional performance.

Does Vapor Smoothing Make Parts Stronger?

While vapor smoothing improves adhesion between layers and enhances the outer surface, it doesn’t significantly affect the internal strength of PETG parts. However, interlayer adhesion is improved.

How Does Laser Beam Profiling Optimize PETG Part Vapor Smoothing?

Laser Beam Profiling enhances vapor smoothing by measuring surface smoothness and uniformity, ensuring that the part’s final surface is consistent across its entire geometry.

How Much Does Vapor Smoothing PETG Cost?

The cost of vapor smoothing PETG varies depending on the solvents used and the setup. Typically, MEK and ethyl acetate are affordable solvents, while vapor smoothing equipment like ventilated chambers and safety equipment can add to costs.

What Are Examples of Vapor Smoothing PETG Products?

Products include consumer electronics, medical devices, custom tooling, consumer goods, and prototypes.

What Filaments Can Be Vapor Smoothed?

PETG, PLA, ABS, and ASA filaments can all be vapor smoothed using the appropriate solvents for each material.

What Is Vapor Smoothing PETG Also Known As?

Chemical vapor smoothing or chemical vapor polishing are other names for the vapor smoothing process.

What Is the Difference Between Vapor Smoothing PETG and Other Methods?

Unlike sanding and polishing, vapor smoothing works at the molecular level to create a smooth, glossy surface without removing material.