Raft vs Brim in 3D Printing: What’s the Difference?
3D printing applications often involve the use of either a raft or brim. Both components serve as a substrate on which the respective object or built. Using a 3D printer, manufacturing companies can build custom-shaped objects layer by later by depositing the material onto a raft or brim. Rafts and brims aren’t the same, however. While they both serve as a base substrate for 3D printing applications, there are some key differences between them that shouldn’t be ignored.
What Is a Raft?
A raft is a flat piece of mesh material that serves as the substrate on which the 3D printed object is built. It typically measures just slightly wider than the initial layer of the object being built. Prior to building an object with a 3D printer, a manufacturing company may lay down a raft. Once placed in the appropriate area, the manufacturing company can begin to build the object by depositing layers of material onto the raft.
What Is a Brim?
Like a raft, a brim is a substrate used for 3D printing. Also like rafts, brims generally consist of a mesh material. Based on their similarities, you may assume they are the same. The difference between them, however, is that rafts go underneath the printed object, whereas brims go around the printed object. A brim can best be described as a flat and horizontal expansion of the printed object’s initial layer. While rafts are placed underneath the printed object, brims are placed around the printed object, essentially creating the appearance of a skirt.
Another difference between rafts and brims lies in their construction. Although there are exceptions, most rafts consisting of multiple layers, whereas most brims consist of a single layer.
Why Rafts Are Better Than Brims
Either rafts or brims can be used in 3D printing applications. Of those two options, though, the former is typically the better choice. Rafts create better adhesion, for example, than brims because they are placed underneath the printed object. It helps the material stick together, thereby improving adhesion.
Of course, the downside to using rafts is that they are more difficult to separate from the printed object than brims. Since they promote adhesion — the object sticks to the raft — more force must be exerted to separate a raft from the printed object. With that said, many manufacturing companies still prefer to use rafts over brings because of their strong adhesion properties.
FAQ для новичков: Рафты, юбки и бримы
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Отписаться от уведомлений вы всегда сможете в профиле автора.
Все три метода служат отправной точкой при печати модели, но у каждого имеется свое предназначение и преимущества.
- Импортируем STL файл с моделью
- Выбираем «Добавить процесс» («Add a Process»)
- Дважды нажимаем на «Процесс» («Process»), чтобы открыть окно FFF настроек (или выбираем «Редактировать настройки процесса» – «Edit Process Settings»)
- Выбираем «Показать расширенные» («Show Advanced»)
- Выбираем вкладку «Добавления» («Additions»)
- Ставим галочку рядом с «Включить рафт» («Include Raft»)
- «Слои рафта» («Raft Layers») позволяет изменять высоту рафта. В нашем примере было нанесено три слоя
- «Выступ рафта» («Raft Offset») определяет, как далеко рафт будет выступать за пределы отпечатка модели. В нашем случае подложка выступает на 3мм в каждую сторону
- «Разделение» («Separation») определяет расстояние между рафтом и изделием. Дистанция будет влиять на легкость удаления рафта после печати, и может быть настроена с учетом модели и используемого филамента. Обычно это значение устанавливается в пределах 0,14-0,2мм.
- «Наполнение рафта» («Raft Infill») контролирует его плотность. Процент наполнения должен быть достаточно высоким для того, чтобы первый слой модели вышел плоским, но не настолько высоким, что его потом будет невозможно отодрать. В нашем случае было выбрано 80-процентное наполнение.
По завершении печати просто снимите рафт с изделия. Обычно это можно сделать руками, но в крайних случаях может понадобиться скребок или тонкий шпатель. Заодно оцените результат настроек разделения и необходимость их изменения в следующем проекте.
Юбки могут иметь и другие назначения. При печати АБС может быть построена высокая юбка – вплоть до высоты самой модели, если на то есть желание – для защиты изделия от сквозняков, вызывающих быструю усадку, кособокость и расслоение. Высокая юбка также может использоваться на принтерах с двумя экструдерами в качестве «соплеулавливателя» для удаления остатков пластика при смене головок.
- Импортируем STL файл и добавляем процесс («Process»).
- Дважды нажимаем, чтобы открыть окно FFF настроек («FFF Settings»).
- Выбираем «Показать расширенные» («Show Advanced»), затем выбираем вкладку «Добавления» («Additions») и ставим галочку рядом с «Включить юбку/брим» («Include Skirt/Brim»).
По окончании печати просто отделите брим скребком или оторвите пальцами
критика и дополнения приветствуются.
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Cura Brim Build Plate Adhesion – Everything You Need to Know!
Back when I had no experience with 3D printing, I used to watch time lapses and always wondered why some printers would print a line of plastic around the model before starting with the actual design.
After doing some research on how to increase bed adhesion without glues and sprays, I discovered what brims, skirts, and rafts are. I learned I should always use one of them even with the most basic print, and I’ll tell you why.
Before going deep into brims, you should first understand what a skirt is. A skirt helps prime the printer nozzle by printing a single line around the base of the model. This gives time for the nozzle to reach its optimal temperature before starting with the base of the model. It allows the flow rate of the filament to be consistent from the start. Unlike a brim, a skirt does not connect with the model.
Brims are like multiple skirts, usually at least five, and start printing from the outside in toward the model’s base to stabilize the print. Unlike a skirt, a brim prints up against the model to help secure it from moving. After it’s printed, you just need to snap the brim off the model and polish if required.
Because the brim is bigger than a skirt, it uses much more filament. However, it warms up the printer a lot better and ensures the flow rate of the filament is acceptable by the time it starts with the first layer of the model.
What Is Brim In Cura?
In Cura, brim is a setting that instructs the printer to print multiple lines around the model for support. Printing a brim primes the printer nozzle, assists with bed adhesion, prevents model warping, and more. A brim prints on the first layer and surrounds the base of the model to reduce print defects.
Adding a brim increases the model’s footprint on the bed, that’s why it stabilizes it, the extra area to grip onto and the fact that it prints snug against the model.
You can set Cura to print the brim underneath the part for extra stability but most of the time you should only print the brim on the outside of the model. Printing a brim underneath the part will use more material, take more time, and be more difficult to clean off afterwards.
How To Activate Cura Brim
To adjust the brim settings in Cura, click on the Settings tab and select Configure setting visibility…
Search for brim in the search bar and check off all the brim settings.
Now you’ll be able to adjust the brim settings in your main menu.
Best Cura Brim Settings
The best brim setting values will depend on what you’re printing, the size and shape. Here are all the settings related to brim in cura with my explanation on how I set them accordingly.
Skirt/Brim Flow
This refers to the flow of filament from the nozzle while printing the brim. I leave this at 100% unless the print instruction says otherwise.
Skirt/Brim Speed
You can set the speed at which the brim prints to be faster or slower than the main part. It’s best to have this setting adjusted to the same speed as your “initial layer speed”.
If you increase or decrease the brim speed, you won’t be able to evaluate the brim accordingly because results will change once it reaches the model.
Skirt/Brim Minimum Length
You can adjust this setting so that your printer extrudes as much filament as required until the minimum length of filament is met. I’ve left mine on the default 250 mm length and it works perfectly for 90% of my prints.
However, if your brim line count is set to 5, it will only print 5 lines and might not reach the minimum length.
Brim Width
The brim width determines the area it will cover on the print bed and the wider it is, the more it will grip onto the bed. Brim width is measured from the model’s base to the outermost brim line.
Brim Line count
The brim line count is the number of lines the printer will make around the model to form the brim. The brim becomes bigger as you increase the lines. This setting will override the width setting if their values don’t match.
Brim Distance
The brim distance is the distance at which the brim prints from the model. I suggest leaving it at 0 mm so that it can support the model. If you increase the brim distance, the model won’t benefit from any extra bed adhesion.
The only time I distance the brim from the model is when I know it doesn’t need stabilization. The reason I print the brim in this case is to evaluate it to identify any defects before printing the entire model. 20 brim lines are enough to evaluate the printer before it starts with the main part.
Brim only on outside
Most of the time, it’s best to leave this box checked, otherwise the brim will print underneath the model and make it much harder to remove. It will also make cleaning the base of your model more difficult after you’ve removed the brim.
Only use this option if the outside brim isn’t holding the model in place.
How To Identify Problems By Inspecting The Brim
A brim is helpful in showing you if there are any problems with the printer before it starts with the major design. These are a few of the things to look out for when evaluating the brim.
Gaps in the brim: If there are gaps in the lines of the brim all the way to the base of the model, you should check your nozzle temperature and filament feed to see why it’s not flowing properly.
Wide brim lines: Wide brim lines can be a sign of the filament flowing too quickly, check that the temperature isn’t too high. Wide brim lines could also mean that the nozzle is too close to the bed.
Inconsistent brim: If the brim is inconsistent, with some lines higher or wider than others, your printer bed probably needs to be leveled. Watch this video if you’re not sure on how to level the bed. I have an Ender Pro 3 but many other printers are very similar.
When To Use A Brim
You should use brim for any project where the bottom of a large model doesn’t cover much of the bed’s surface. The brim will make the footprint of the model much bigger to stabilize it.
If you don’t need extra adhesion and stability, I recommend printing a brim of 10 to 20 lines wide to warm the printer up.
If you print a brim every time, you’ll be able to check if the printer is running smoothly before it gets to the model. Brim inconsistencies can tell you a lot about what’s wrong, from an uneven bed to a cold printer nozzle.
Will Brim Prevent Warping?
Brim will prevent warping because it adds support, secures the base of the model, and helps it stick in position. With the model’s base being secured by the brim, it’s less likely to have structural defects, the brim holds the part in place so that it doesn’t move on the bed.
Which Is Better, Raft Or Brim?
In most cases, it’s better to use a brim instead of a raft because a brim doesn’t take so much time and material to print. A brim is also easier to remove than a raft and it doesn’t go under the model, so you only have to smooth down the edges if need be.
When you use a raft, you’ll need to clean the bottom of the model from where you pulled the raft off.
A brim also makes supports stick better so create the brim wide enough to reach all the supports.
A raft is good to use if the bottom of the model has tiny features that make little contact with the print bed.
What is a raft?
How Do You Remove A Brim?
You can remove brims by hand with little effort. Bend the brim back and forth to weaken it and snap it off the model. You can also use tools like needle-nose pliers, tweezers, and cutting blades to clean the brim off.
I recommend plucking the brim off by hand as the chance of damaging the model is far less than when using tools. If there are any remaining bits I just cut them off with a blade and sand the edges down if I really want it to be super smooth.
Related Articles
Summary
A brim is useful in stabilizing models by increasing the footprint (surface area) of the model on the bed. Brims also cause your printer to warm up adequately before it prints the actual model.
If the brim has inconsistencies, you can stop the print, adjust your printer and then restart until the brim printed perfectly.
Make sure you check out our YouTube channel, and if you would like any additional details or have any questions, please leave a comment below or join us on Discord. If you liked this article and want to read others click here.
I’m Rob, the founder of 3dprintscape.com. I’m a Marine Corps vet with a master’s degree in Information Systems and have been working in the technology field for over a decade. I started working with 3D printers because I was fascinated by the technology and wanted a hobby that my kids and I can enjoy together.
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3D Printing Brim: What is it? How & When to use it? – Guide
As early as the 1980s, Japanese scientists, such as Hideo Kodama, filed a patent for 3D printing. In 1987, the first 3D printer hit the market. While these were the first simple print attempts back then, 3D printers of today have sophisticated technology that can be used to make many products on their own. This requires some practice.
You will encounter obstacles when 3D printing, but there are solutions for them. It is very annoying when the prints do not adhere to the build plate and become deformed or even fall over.
A little fine-tuning, like leveling the printing plate, rarely solves the problem. A ‘brim’ around the object can help!
Unlike a ‘Raft‘, a brim is easier to remove because a brim consists of only one layer on the outside around the object, rather than several complete layers under the object like the raft.
The main tasks of the brim in 3D printing are as follows:
- Optimizing the adhesion of the printed object to the printing plate.
- Stimulate the filament flow before the actual printing begins.
- Avoid the bending up of edges and corners (warping).
- Detect other printing errors at an early stage (leveling of the print bed, nozzle dripping, etc.).
Table of Contents:
How the Brim Stabilizes Your 3D Print
Using a brim, your 3D printer prints a circle around your 3D printed object. The key here is that it connects to the edge of your print, unlike a Skirt, where the circle is drawn a small distance around the print object.
Classic Brim (source: reddit)
The brim, which is printed directly on the object to be printed, usually corresponds to only one layer height. This gives your print object more stability, and the print adheres reliably even to larger surfaces.
The brim is a so-called auxiliary print that supports your actual print object. The use of a brim increases the base area of the print, so to speak, which strengthens adhesion, especially on the heating bed. This prevents misprints and saves time and costs.
Most 3D printers allow you to specify the width of a brim in the slicer and adjust the brim to the size of the printed object. The width of a brim results from the number of lines that enclose the print, like the brim of a hat.
All Cura Brim Settings
Without a brim, a round object, such as a pipe, would only have a very narrow degree of adhesion. If the printing plate moves, the printed product could deform or even tilt. For tube-like objects, the brim could be additionally reinforced by inner lines with several outer rings, preferably 3 – 4 (sometimes more). The lines of the brim are optimally applied to the printing platform with a distance of ‘0’, i.e. firmly adjacent to each other. Only in this way does the brim give the print object the necessary stability.
Another advantage of a brim:
Printing the circle around your print gives you other advantages. You find out how your printer works before you actually print. Also important to a clean 3D print is how the filament comes out of the nozzle. If you notice that the filament is not cleanly applied to the brim or that it runs out of the nozzle before printing, you can still take countermeasures at this point and make or test various settings.
How to Create a Clean 3D Print Using a Brim
As soon as the circle, printed with the brim printing technique, touches your print and you notice that filament is in the way, you can now prevent an unclean print.
Here’s what you need to know: If the print button comes into contact with the build plate, filament can get contaminated in the wrong place. You can prevent this messy application by simply pushing the filament aside before the printer nozzle starts applying the material.
Many people stop printing altogether, which is unnecessary. If smearing still occurs, the excess filament can be pulled from the build plate while you print the brim. This will make the brim a little narrower, but this will not affect the rest of the print.
3D Printed Keycaps with a Brim (source: reddit)
With Patience and a Brim to Clean Print
If your printed object has a high degree of stability thanks to the brim printing technique, other factors play a major role in successful 3D printing.
One component that should not be underestimated is patience.
Just quickly printing an object rarely works well. If you apply layer after layer neatly, your printing experience will be smooth. But that takes time. The ‘first layer’ of your 3D print is crucial for all further layers.
If this does not have sufficient adhesion, is uneven or other points are not in order, this can negatively affect the further printing of your 3D print object.
Therefore, the printing of the first layers and also the next ones should be done slowly and very accurately. It is recommended to reduce the printing speed for the first layers. This should be about 50% of the usual speed. This has the advantage that the filament is applied cleanly and evenly. At the same time, you will be able to detect any problems that may arise through the use of a brim in good time.
What Else the Brim Can Do
A brim, professionally applied to the printing plate, not only supports the object to be printed in terms of adhesion and stability. At the same time, the brim protects the object from external influences such as drafts.
This means that the printed object does not cool down as quickly, which counteracts possible deformation and also promises better adhesion in turn.
Brims can help you even with bridging! (source: edditiveblog)
A Brim Seldom Comes Alone
How well a brim does its job depends on many other points. Those who choose filaments that are too inexpensive must expect poorer print quality in 3D printing as well as insufficient adhesion of the object to be printed to the printing plate.
In addition, it is essential for quality printing that you know your printer well. In the beginning, the operating description will help you. Often the object does not adhere to the printing plate because of incorrect settings on the printer, and even the brim can only do so much. The printing temperature also plays an important role. If all print settings are taken into account and you use high-quality material, nothing will stand in the way of your printing fun with a brim as support for your print object.
Besides good printer material, the printer of course plays the main role for a good end result. Only a few inexpensive 3D printers offer a higher standard. You will hardly find many settings, such as the Eco mode, in the budget model. But even with high-priced printers, the brim is only a support for the print object, but not a guarantee for the perfect end result.
When the Print Object Detaches from the Brim Structure
The brim is supposed to provide adhesion and stability to the 3D printed object. This works in most cases. And yet it happens quickly – the printed object detaches from the brim after a certain printing time. Especially newcomers in the field of 3D printing struggle with such problems.
You can rest assured. The brim is not the issue. 3D printed objects detach from the brim due to the following issues:
- Distance between print bed and nozzle too far.
- Dirt film on the print bed.
- Individual layers, especially the 1st layer, are rather loose and not firmly printed onto the print bed.
Brim – FAQ
How do I remove the print object including the brim from the printing plate after printing?
Good adhesion to the printing plate as a basis for successful 3D printing is essential. Sometimes it happens that this is too strong. The print object sticks to the print bed together with the brim like cement. The brim itself is relatively easy to detach again, since it is only a few millimeters or one layer high. Usually, the entire print object comes off by itself when the filament has cooled down properly and thus loses its adhesion.
If this is not the case, it may help to carefully loosen the object with a spatula or other narrow object. Possible residues of the brim usually come off the printed object easily.
Do this with extreme precision to avoid damage to the part as well as scuffs and scratches on the print bed. To counteract problems of this kind, you could deselect the additional adhesion settings, such as the brim, in the slicer before the next print.
You should be sure that the object itself has sufficient adhesion potential. With increasing experience, you will know how to avoid too strong adhesion of the object to the print platform. What else helps against too strong adhesion of the print object to the print bed:
- Match printing temperature to material,
- Set design correctly in advance; more brim required for a design with holes (very strong adhesion),
- Correctly level the printing bed (e.g. avoid too small a distance between the nozzle and the print bed).
For which objects is a Brim suitable?
As a general rule, it can be said that high print objects with a small footprint, in particular, require a brim for more adhesion. Even experts argue about the number of loops that are applied as a brim around the object.
There is no clear statement but rather estimates. In my experience, 6 – 10 loops are a good value to start with if the adhesion is to be high. The brim itself usually has a low height of 2 to 4 mm.
Is One Layer on a Brim Really Enough?
With filaments that have a strong tendency to warp, it can be useful to print a brim of more than one layer so that it does not tear off the printed part. Otherwise, the print model will warp when it cools down.
Warping is one of the most annoying defects in the FDM printing process. Therefore, a multilayer brim offers good protection.
Conclusion
Despite highly developed printer technology, there are always sources of error in 3D printing, such as the detachment of the print object from the print platform. Aids such as a brim help the print object to adhere.
However, a prerequisite for a successful print object is the interaction between all the necessary components such as a printer, filaments, technical knowledge and the brim.
Even while reading, it becomes clear to you that a lot of patience and intuition are required to design your print object as desired with the brim solution. Nevertheless, 3D printing with a brim is no rocket science.
The best way to grow into the 3D printing process with brims is through your own experience.