Sophia Delgado
There are several methods to smooth 3D prints made from PLA, including sanding, polishing, and the use of chemical solvents. While nail polish remover can be used to smooth PLA parts, its effectiveness is limited. Nail polish remover contains acetone, which can soften PLA but does not melt it readily. Additionally, it may cause discolouration to coloured PLA, while having no effect on natural PLA. It is recommended to use ethyl acetate, a solvent found in non-acetone nail polish removers, as a safer alternative to other chemical solvents.
| Characteristics | Values |
|---|---|
| Effectiveness | Limited |
| Application | Applied using a cloth or cotton swab |
| Alternatives | Sanding blocks, sandpaper, nail files, spray paint, primer spray, ethyl acetate, tetrahydrofuran, dichloromethane, chloroform |
| Discoloration | May discolor colored PLA |
| Safety | Read the safety data sheet before use |
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What You'll Learn
Nail polish remover can smooth PLA parts
It is possible to use nail polish remover to smooth PLA parts. Acetone, a common ingredient in nail polish remover, can be used to smooth PLA prints. While PLA is not very soluble in acetone, prolonged exposure can soften it.
Nail polish remover with a high concentration of acetone or other chemicals can smooth PLA. However, it is important to note that the smoothing effect may be temporary, as the PLA can split or shrink after treatment. Additionally, acetone can cause warping on thin surfaces, and vapour chambers may not produce the same level of smoothness as controlled dipping or brush application.
Some people have suggested using a methyl chloride and acetone mix, but there are limited results available. It is important to note that vapour will make the PLA shiny, but it may not necessarily make it smooth. For a truly smooth finish, glossing the piece after vapour treatment may be necessary.
Another alternative method to smooth PLA parts is to gently heat the plastic with a hair dryer and then use a utensil to smooth out the plastic. This method only slightly melts the outside of the model and should be done with care.
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Acetone softens PLA but doesn't melt it
Acetone is a solvent that can be used to dissolve certain types of plastics, such as polystyrene, polycarbonate, and some forms of ABS (Acrylonitrile Butadiene Styrene). It works by breaking down the polymer chains in these materials, causing them to dissolve. However, not all plastics are soluble in acetone. For example, polyethylene and polypropylene are resistant to acetone.
While acetone can dissolve some types of plastics, its effectiveness with PolyLactic Acid (PLA) is limited. PLA is a popular 3D printing material known for its ease of use, affordability, and availability in various colours and varieties. When it comes to acetone and PLA, the solvent doesn't "melt" PLA readily, but it can soften it with prolonged exposure. Some cheaper PLA filaments may react with acetone or partially dissolve due to questionable additives, but higher-quality PLA is typically immune to this.
To effectively dissolve PLA, specific conditions must be met. Research has shown that PLA with a lower molecular weight, consisting of shorter polymer chains, is more susceptible to dissolution by acetone. However, most PLA resins on the market have a relatively high molecular weight, making them less reactive to acetone. Therefore, finding a PLA filament with a low molar mass is crucial for successful acetone dissolution.
Despite acetone's limited ability to dissolve PLA, it can still be used for smoothing PLA prints. By exposing PLA to acetone vapour, it becomes flexible, potentially improving the surface finish. However, this method may not be as effective as other solvents, and the use of acetone on finished 3D prints is not recommended as it can make the material extremely brittle.
Overall, while acetone can soften PLA, it doesn't readily melt it. The effectiveness of acetone on PLA depends on various factors, including the quality and molecular weight of the PLA filament. When working with acetone and other solvents, it is important to prioritise safety and take the necessary precautions to protect oneself from harmful chemicals.
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Nail polish remover is applied with a cloth or swab
When using nail polish remover, it is important to be cautious as it contains chemicals that may be harmful if used too frequently or without proper ventilation. Acetone, a common ingredient in nail polish removers, breaks down nail polish quickly and efficiently but can cause headaches and dizziness if used for too long. It is also highly flammable, so keep it away from open flames. To protect your skin from the drying effects of nail polish remover, it is recommended to moisturize with lotion after use.
Nail polish remover can be applied with a cloth or swab. For removing nail polish from nails, a cotton ball or swab soaked in nail polish remover can be used. This method is also effective for removing nail polish stains from clothes. Simply blot the stain with the cotton swab or cloth dipped in nail polish remover. For gel nail polish, board-certified dermatologist Shari Lipner recommends using plastic food wrap instead of foil. Wrap your nails with the plastic and leave it on for about 10 minutes. The acetone will loosen the polish, which can then be gently wiped away with a warm, wet washcloth.
If you do not have access to store-bought nail polish remover, there are some alternative methods you can try. Applying a clear coat of nail polish and quickly wiping it off can help soften and remove old polish. Using alcohol as a solvent is another option; soak your nails in rubbing alcohol or apply it with a soaked cotton ball to dissolve the polish. High-alcohol content spirits like vodka, grappa, or gin can also be used in a pinch. For a more gentle approach, scrub your nails with toothpaste or soak them in a mixture of hydrogen peroxide and hot water to soften the polish before wiping it away.
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Sanding PLA parts with sandpaper also smooths it
Sanding is a common technique to finish 3D prints made of PLA. It helps to remove layer lines and rough areas, creating a uniform and smooth surface. The process of sanding PLA parts involves starting with a low grit sandpaper, such as 100 to 200 grit, and sanding away at the bumpy striations and any support material left behind. It is important to avoid corners, edges, and fine details when using low grit sandpaper as it can quickly tear away the material. As you progress through the grits, you will need to remove less material from your print. When using 400 grit and above, you will mostly be polishing the surface rather than removing any major blemishes.
Using water while sanding with 400 grit sandpaper can help to keep the paper from clogging and results in a finer finish compared to dry sanding. You can continue alternating between sanding and spraying filler primer until you achieve a smooth surface. After sanding, it is important to clean the part with soap and water to remove any residue.
While sanding is a straightforward and effective method to smooth PLA parts, it can be tedious and time-consuming. Additionally, PLA tends to become soft and gummy if sanded too aggressively, so it is important to be careful and patient during the process.
Nail polish remover has also been suggested as a method to smooth PLA prints. However, opinions vary on its effectiveness. Some people have reported that it can smooth PLA, especially if it contains acetone, but others have cautioned that it may discolour coloured PLA or cause splitting and shrinkage after application. It is recommended to test on a small area first to ensure it does not damage the PLA.
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PLA parts can be smoothed with spray paint
There are several methods to smooth PLA 3D prints, ranging from beginner-friendly techniques like sanding to advanced methods like solvent application. While nail polish remover has been used to smooth PLA, it is not a recommended method due to its potential to damage the material. Instead, spray paint is a commonly used method to smooth PLA parts and improve their appearance.
Spray paint can be used to fill in layer lines and create a smooth and professional finish. It is a simple and effective method that can be done with a can of spray paint and a fan. First, clean the model of any dust and ensure it is dry. Then, spray the model with the selected colour of spray paint, followed by a quick spray of polyurethane. Place the model under a fan to prevent drips and accelerate drying. This technique fills in the layers, holes, and printed flaws, resulting in a smoother surface.
It is important to follow safety warnings and work in a well-ventilated area when using spray paint. Additionally, multiple thin layers of paint are more effective than a single thick coat. Each layer should be light and allowed to dry before applying the next one. This process can be repeated until the desired level of smoothness is achieved.
Before painting, it is recommended to apply a primer to ensure proper adhesion of the paint. Alternating between sanding and applying primer can also create a smoother surface. However, it is crucial to avoid spraying too closely to the print to prevent noticeable drips.
While spray paint is an effective method for smoothing PLA parts, it is important to consider the additional time and cost involved in the process. Other methods, such as epoxy resin or chemical smoothing, can also be explored based on the specific requirements and desired outcome.
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Frequently asked questions
Yes, nail polish remover can be used to smooth PLA parts. It is limited in its effectiveness and may not work as well as other methods. Nail polish remover can be applied using a cloth or cotton swab.
Sanding blocks, sandpaper, and nail files can be used to smooth PLA. Sanding alone can reduce the appearance of layer lines. Another approach is to fill in the crevices with primer spray and then sand down the excess primer.
Ethyl acetate, a solvent found in non-acetone nail polish remover, can be used to smooth PLA. Other chemical solvents include tetrahydrofuran, dichloromethane, or chloroform, but these substances are difficult to obtain and can be dangerous.
