PLA Smoothing: A Complete Guide
The invention of 3D printing technology in recent decades has helped people to actualize their creative ideas. The most extensively utilized material in this area is PLA (Polylactic Acid), which is prized for its biodegradable cost-effectiveness and ease of usage. However, including the filament and pushing the print button are not enough to produce flawless PLA 3D prints. So, this article will cover everything from printer settings to post-processing methods as we explore the details of getting smooth PLA prints.
What is PLA Smoothing?
The process of PLA smoothing involves eliminating noticeable layer lines that form during the creation of 3D-printed objects. A 3D print that has been created develops a smooth texture, losing the appearance of being printed while taking on the look of plastic that has been injection molded. The simplicity of usage, low price, and broad availability of PLA make it one of the most widely used materials for 3D printing. Compared to ABS filament, PLA has less warping tendencies and works at a lower temperature, which makes it an excellent option for beginners.
There are many methods for creating a polished surface on PLA prints, but they all need to either eliminate the excess plastic that causes visible layers or utilize brush-on coatings to fill in the small spaces between layers. Each method has advantages and disadvantages that are relevant to the needs of the project at work.
Why Use Smooth PLA 3D Prints?
The advancement of PLA 3D printing has various rationales, with aesthetics emerging as the most significant one. Many fans say they would love to do away with the traditional 3D print look that includes striated surfaces. This tendency strengthens if one runs a 3D printing enterprise as the uneven texture could not be well greeted by clients.
Also, there are situations where layer lines need to be fixed or removed. Consider a case in which the 3D print is used as a prototype for a silicone mold; in this case, smoothing needs to be done to prevent the transfer of the texture. This ensures that resin casting materials offer a glossy finish rather than a matte one.
The durability of PLA prints can be further improved by some PLA improvement techniques, such as the use of epoxy coatings. These coatings safeguard the layers from dirt and moisture by sealing the layers. For prints meant for outdoor use, this feature is particularly useful. Even simple processes like sanding and spray painting the prints may improve their heat and water resistance. Another fantastic benefit of epoxy coatings is their capacity to make PLA prints safe for consumption. This level of safety cannot be achieved by just applying a PLA solvent to the print's surface.
How to Smooth 3D Prints With PLA?
1. Removal of Extra Trash
In some cases, a printed object could still have extra material, like a brim or support structures. It's necessary to get rid of these residues to produce a polished final product. Several instruments can effectively help to achieve this task.
2. Rotary Multitool
A useful option for improving 3D printing is to use a Dremel. These tools are used similarly to knives, but due to their wide variety of bits, they are especially effective for cleaning off tight spaces and inner edges of components. When handling a rotary multitool, there are two things to consider. First of all, they work on speed rather than torque, meaning that increasing rotational velocity is better than increasing pressure, which has less desirable results. By doing so, the effort decreases and the tool's life is increased. Secondly, avoid using excessive force or prolonged dwelling on a particular location, as this is how the power tool interacts with plastic. When anything is done overly, heat is produced, which mistakenly melts the plastic and causes unwanted depressions and holes.
3. A Precision Cutting Tool
To begin with basic techniques, let's discuss the refinement of surplus material using a craft knife, with X-Acto knives serving as an excellent example. Consider the blade type initially when choosing a knife for improving 3D printers. The adaptable standard size 11 blade works well in most situations; however, different sizes might be better suited for particular needs.
Place the blade on a print edge and run it across the surface to pick up supports or extra residues. Take care when exerting pressure because too much pressure could accidentally remove too much material, affecting the integrity of the print. Continue doing this until each edge is smooth. And at last, if you don't have a utility knife, a single-edged razor blade will work just as well. However, great care is advised; sacrificing safety for a perfect finish is not smart.
4. Sanding
Sanding: Image Source: makerbot.com
A simple technique called sanding works well for creating smoother 3D printing. There are many ways to sand these prints, as you've probably discovered through direct experimentation. Using a sanding block is suggested for prints with large surface areas. This lowers the strain on your hands and guarantees even abrasion of the print and sandpaper. On the other hand, nail files perform well for prints with sensitive details. The wide range of shapes and sizes offers versatility; the choice depends on the particular sanding work, with the cheap cardboard files often proving sufficient.
Use circular motions throughout the sanding process that are counter to the path of the layer lines to maximize the results. Depending on the finish you want, it is advised to gradually increase the sandpaper grit, starting at 400 grit and working up to 4,000 grit.
The idea of wet sanding has also come up. To refine without significantly removing material and leaving a polished surface, using high-grit wet sandpaper is outstanding for the final sanding stage. With the possible exception of the occasional wetting of the sandpaper, the process is like regular sanding.
5. Surface Melting
PLA does not perform well in high temperatures, making it unfit for outdoor applications. You can still improve your prints by using heat's effect on the plastic, too. The tool of choice for this is a heat gun, usually set at its lowest temperature. By placing the print on a turntable and carefully rotating it to ensure even heat distribution, optimal and consistent results can be obtained. This method not only prevents excessive melting in particular areas but also enriches the result. Heat guns can't produce the heat intensity needed to melt the plastic. The majority of models are below the PLA's 60°C glass transition temperature, thus requiring considerable time before any alterations occur.
6. Surface Coating
Consider adding another layer of material to your print using methods like spraying, painting, or dipping to give it a shiny look. This method creates a glossy, uniform appearance while effectively hiding surface texture flaws and layer lines. The use of an epoxy coating or choosing a paint primer are two typical methods of using PLA.
-Epoxy: The resin-based coating epoxy serves similar functions to a primer, albeit with a more challenging application procedure. Epoxy must first be blended, which gives another degree of difficulty. Epoxy, however, excels primer in its capacity to efficiently fill significant spaces or print process leftovers.
The epoxy finishing process involves mixing up an epoxy resin mixture and applying it with a brush to every surface of your print. It is essential to ensure constant application to prevent differences in coating thickness on the final print.
-Primer: Sanding and using a primer combined are complementary techniques. Removing layer lines and creating a smooth surface are the main objectives of primer use. Let the primer dry for some hours after applying it. Primer can be sanded much more easily than PLA as it is softer than PLA.
7. Chemical Smoothing
As previously mentioned, there is still a way of getting a surface roughness that is comparable to ABS, even though PLA doesn't respond to acetone smoothing as ABS does. Introduction to Polymaker A PVB formulation called Polysmooth is like PLA but can be chemically smoothed. However, the Polymaker Polysher, a specialized container that emits isopropyl alcohol, must be applied during the procedure. The filament and this alcohol interact, causing the filament's outermost layers to get smoother.
It does require a little cash upfront to get every one of the required parts. But it could be prudent to think about investing in and setting up this particular system if your needs call for several elegant prints.
SelfCAD: Best 3D Printing Software
There are numerous options for 3D printing software; however, we highly suggest SelfCAD. SelfCAD is a 3D modeling software that has a user-friendly interface and it runs both on Windows and Mac. It has an easy-to-use interface and a complete toolkit for creating 3D models and even preparing them for 3D printing without having to switch to a separate software. It comes with various interesting tools and several 3D shapes that you can use as a foundation for creating your designs. Get to know how to modify 3D shapes to create your intended 3D models in SelfCAD in the video below.
You can also import STL files and modify them based on your requirements. This is helpful for those who don’t want to create 3D models from scratch and they would like to use the already existing designs as the foundation. Get to know how to edit STL files in the video below.
In addition to 3D modeling tools, SelfCAD also comes with a powerful in-built online slicer that you can use to slice your designs and generate the Gcode to send to your 3D printer. The video below shows how you can slice files in SelfCAD.
SelfCAD also comes with many resources to help you learn how the software works. For example, there are interactive tutorials, SelfCAD academy, as well as many Youtube videos like 3D modeling 101 series, and also 3D modeling tutorials for beginners that can help you get started in 3D modeling and SelfCAD in general.
Mastering the Art of Smooth PLA 3D Prints for Professional Results
Creating smooth PLA prints is within your reach. By adjusting settings, leveling the bed, and fine-tuning the extrusion, you're on the right path. Remember to try post-processing tricks like sanding or painting, and keep your printer well-maintained. With these steps, your PLA prints will shine with smoothness and precision.
Enjoy powerful modeling, rendering, and 3D printing tools without the steep learning curve.
Need to learn 3D modeling? Get started with interactive tutorials.