Heat bed for 3d printer
Heat Beds in 3D Printing – Advantages and Equipment – Boots Industries
Why use a heat bed?Heat beds are used because they dramatically improve print quality by keeping the extruded plastic warm and thus preventing warping. Warping is a common condition caused by plastic on the edges of the part cooling down at an uneven rate when compared to the plastic inside of the part. The result is that corners warp up and deform your model.
Rafts are an effective ”no-heat bed” strategy to deal with warping when a heat bed is not available.In the past, techniques such as the raft (building parts on top of a ‘raft’ of material which is larger than the final part onto the build surface) were used to prevent warping by increasing the surface area of the part (and increasing it’s adhesion – thus fighting warping).
Derived from the raft, mouse ears are a clever and effective technique to make sure that the corners of your prints are well secured to the platform and won’t lift. Although they offer greater adhesion by increasing the surface area for your part to grip onto the bed, they are not 100% effective without a heat bed. Sometimes the warping forces are simply too great and can overcome the mouse ears.
Heat beds work to prevent this warping effect by keeping your part warm during the whole printing process which keeps the material at or above heat-deflection temperature (the temperature at which it is malleable). Keeping the parts in the heat-deflection range ensures that the part remains flat on the print bed. Heat beds, in combination with other tools to increase adhesion, will be covered in this article to bolster your ability to fight unwanted effects and improve your printing quality.
The following video shows what happens with no heat bed and no adhesive added to the glass. It depicts what can typically happen when printing on a non-sticky platform with no heat bed – Disaster!
No heat bed, print stuck to the extruder. Disaster!No adhesive used; a dramatic result and wasted PLA!There are several types of heat beds & heating elements. We specifically discuss the PCB heat bed, the polyamide film heater (kapton film heater) and the aluminium clad heater. You can find a more exhaustive list of heater types here.
Types of heat bed
Regardless of the heat bed you are using, you should generally use these temperatures (heat deflection points) for PLA and ABS:
PLA | 50-60°C |
ABS | 100-110°C |
The MK2A heat bed (200mm x 200mm) is a good example of a PCB heat bed. These heat beds are used by many 3D printers and our own (Rostock V1.0) due to their great performance and affordability. This particular heat bed has 2 integrated LEDs and an integrated resistor which makes it rather ‘plug and play’ when compared to other solutions.
You can generally expect a simple & clean implementation with these heat beds thanks to the 5 holes available for leveling and installation purposes. They require little vertical clearance when compared to a stainless steel sheet mounted with aluminium clad resistors and offer an even heat distribution. The cons is that they can be slow to heat up especially when used with another surface such as a glass pane.
Kapton (Polyamide) film heaterKapton or polyamide is well know as a tape of choice for print surfaces, because of its heat resistance, smooth finish and high adhesion for PLA. Now think about two films of polyamide with a heating element sandwiched in between, now you have a polyamide film heater. Obviously, these are very thin, easy to install with an adhesive back, reliable and heat really fast. They have an integrated thermistor and are provided, unlike the PCB heat bed, in an unlimited variety of shapes. For these reasons, this is the type of heater foil we use on our latest 3D printer (BI V2. 0).
Aluminium clad heatersThis type of heaters is both very efficient and inexpensive, but they require more installation steps than the last two heat source we’ve discussed. As a matter of fact, they need to be screwed onto a surface, normally a stainless steel or aluminium plate. Then, the electrical circuit needs to be completed with a thermistor and an insulator if you have any temperature sensible elements under the print bed. Finally, it’s also a good idea to use thermal paste between the clad heater and the surface to be heated.
Surface to use with heat bedsAll the heat sources mentioned in this article will typically need an added surface to preserve the quality & integrity of the heating element over time or to provide protection in the event of a hotend collision. Obviously, the aluminium clad heaters are always used in conjunction with a surface.
The recommended print surface to be used with a PCB or Polymide film heater is a borosilicate glass, or when unavailable, a tempered glass. For the PCB heat bed, we recommend layering Kapton tape or using a thin glass (2 mm) over-top.
Painter's tape & Kapton tapeIn addition to a heat bed surface, most users will experience that some form of adhesive or method is required to make PLA or ABS stick properly. This is where Kapton tape, painter’s tape, glue or hairspray comes into play.
Painter’s tape is an ideal product for printing ABS with a heat bed because of it’s textured surface increasing adhesion. We’ve used it with varying degrees of success and others report great results as well.
As far as PLA is concerned, our experience is that it doesn’t stick well to heated painter’s tape and that painter’s tape itself doesn’t stick well to the glass when heated. However, we found that PLA sticks very well to Kapton tape which is typically layered to cover the entire print area. The Kapton tape needs to be periodically replaced and this process can be tedious. To remove this obstacle, you can buy Kapton tape in wider rolls which means you need to layer a lesser amount of strips onto the print area to fully cover it.
Hairsprays & GluesGlues are frequently used to make sure your print “sticks” to the print surface. The most common glue we have seen is the typical arts and craft glue stick (Elmers). This technique works well with ABS in conjunction with painter’s tape.
In the PLA department, we prefer to use hairspray on a glass surface. The glass surface is really flat and produces a really smooth finish for our parts. Another advantage of hairspray is that it can be applied in a few seconds and will typically create a thin film that strips away with the printed part or is easily scraped with a wood chisel or similar tool. Sometimes we use a wet rag to remove hairspray residue from the underside of parts when it’s not desired for aesthetic reasons.
What we recommendWe recommend the PCB heat bed or Polyamide film heater in conjunction with a glass surface. For PLA we always apply a thin coating of hairspray and so far this simple combination has been producing great results.
3D Printer Heated Bed - Everything About Heated Beds
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Table of Contents
With the advancement in 3D printing, a lot of new research and experiments have surfaced. Many of them are tailored towards finding the best way to increase the first layer adhesion.
And, we all know why it is so important. A 3D printer heated bed can handle that part pretty well. Although there are other alternatives to work with the first layer, nothing beats this one.
Most importantly, print beds are a very crucial part of the overall design of the machine. This is because, without a print bed, you won’t be able to create your models.
Hence, realizing how you can make the best use of it must be your first priority to know. Understanding the different types of heated beds and their usefulness would help you select the right device.
So, before we progress to explore everything about the heated bed, let us get an idea about what 3D printing is. Most of us already know about it, but a quick recap will only ensure that all our readers are on the same page.
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What is 3D Printing?
We have been hearing about additive manufacturing or 3D printing for a long time now. There are few lucky ones who even had the chance to work with this technology. But it’s never late whenever you decide to do something.
3D printing has emerged as one of the most revolutionary technologies and is propagating to impact the entire ecosystem of manufacturing units.
But what the technology really entails or means? This is a process where the 3D printers create layers of 3D models, one over the other, to create a complete item.
There are various 3D Printing processes available. For instance, FDM, SLS, SLA, and many others. These differ in the way the layers are created and connected. However, the basics remain the same. The layers forms over each other to build the entire 3D model.
3D printing has made the creation of extremely detailed models and structures possible at much faster and affordable rates. But certain precautions need to be taken while using the printer to ensure the part being printed adheres closely to the desired specifications.
However, 3D printing comes with its own challenges. And, the biggest setback is when the layers rapidly heat and cool down.
One of the serious problems that occur because of such a process is wrapping. It changes the shape of the 3D model and deforms it. Hence, running the entire 3D printing project.
To cater to the problem, the 3D printer heated bed surfaced. These print beds are very successful in allowing the proper cooling of the layers.
At the same time, these help in controlling the temperature while the 3D Printing is in process. Hence, further resulting in proper bed adhesion.
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What is a 3D Printer Heated Bed?
Coming back to the topic in the light, we must answer the question: What is a 3D printer heated bed? While we have already discussed in brief about the way heated beds are useful, let us find out more about them.
Heated Beds Using PCBs as Heating Element
A 3D printer heated bed design can differ. Among the most common types, the heated bed makes use of circuity boards or PCBs as the heating elements.
These are available with the budget 3D printers. However, these won’t last long if your 3D printing projects are complex and require frequent jobs with 3D printers. In short, they are meant for smaller projects that do not take much longer to complete.
The reason why these are not suitable for complex 3D printing is that the PCBs are made of copper s and aluminum strips.
And, these are susceptible to deformation when subjected to heat for longer periods. Over time, the heated beds will fail to do the task for which it was chosen in the first place.
There is one more problem that won’t be acceptable to many. These take a longer time for heating up. You can actually get rid of that problem. But you may have to spare some more bucks to get the larger power supply source connecting the bed.
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Heated Beds Using AC Silicone Encapsulating Heated Element
One more type of heated bed is the one that uses AC silicone encapsulating heated elements. To design the arrangement, the heated element is stuffed between glass pieces and a thermal insulator.
This is to minimize the excess leakage of heat and to deliver the maximum amount of heat to the printing surface. Hence, realizing the efficient design for the creation of 3D printer heated bed.
Moreover, the electricity consumption is also less. And, they can work for longer without giving any trouble to the users.
You can 3D print without much hassle when using the heated bed with AC silicon encapsulating heated element. In addition, these are highly portable too. With all the right perks, it is worth spending a little more if your goal is to 3D print for long.
Working of 3D Printer Heated Bed
The 3D printer works by extruding the plastic filament over the printed bed. Right after coming out of the extruder, the filament starts cooling.
As we all know, with cooling shrinkage comes hand in hand. The problem arises when the layer does not cool consistently at all points. This leads to uneven shrinking and ultimately, warping of the entire 3D model.
To avoid plastic from cooling at different rates at varied points, heated beds were introduced. The job of the 3D printer heated bed is to make sure that the parts do not cool completely unless the printing is still in process. This allows for a more even shrinking process.
In short, the heated beds mainly take care of two things. First of all, by increasing the surface energy of the print bed, the heated bed strengthens the bonding of the top layer.
Plus, it ensures that the bottom layer stays hot enough for avoiding the warping issue in any stage of the 3D Printing process. Hence, the heated bed maximizes the efficiency and avoid excessive cooling of the layers.
When the filament is deposited on the print bed through the extruder, it carries with itself a certain degree of heat. For the best results, the heated bed temperature must be below the glass point.
This is to turn the liquid filament in solid form. The temperature sensor is responsible for maintaining the required heat of the print bed.
You may have to go through a few trial and error to understand the correct calibration of your machine based on the filament you use. This is because the melting point of filament differs widely.
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Few 3D Printer Heated Bed DIY Designs
We have already discussed the most basic one before. Let’s elaborate on the topic a little bit.
Apart from the PCB and AC Silicon encapsulating heating element, there are other DIY designs to replace your non-heated bed with a heated one.
Polyamide Film Heater
Polyamide which we also call Kapton is already providing huge benefit as a tape for print surfaces. These are best when used with PLA filament.
By providing efficient heat resistance, and high adhesion for printing with PLA, these are already very popular. These also help in increasing the surface finish of the 3D models.
However, you may not know that when coupled with a heating element which when sandwiched between two films of Polyamide you can come up with a Polyamide film heater.
Plus, they are simple to install as well by adding an adhesive to the back. These heat up really fast.
Moreover, these can be prepared in different shapes and sizes. And, are easily portable. Hence, a great choice for many 3D printing experts as well as beginners.
3D Printer Aluminium Clad Heater
If you are looking for the most effective as well as the inexpensive solution, this is what you must look for. However, do not forget, you may have to go through more steps for installing these heaters to your 3D Printer.
Not to forget, you must also require to screw these onto a surface. Usually, users suffice the arrangement with a stainless steel or 3D printer aluminum heated bed.
Later, you must complete the electric circuit arrangement using a thermistor and an insulator. It is the best way to go about it even if you do have any temperature sensible elements stuffed under the print bed.
Last but not the least, a thermal paste must stay between the clad heater and the build surface. This further enhances the healing process and brings more perks for the users.
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Do I Need A Heated Bed?
Because a lot of 3D printers do not have a heated bed, the question is: Is heated bed required? It is okay to be attentive to the details.
You may have heard that PLA does not need a heated bed to work with. Or, you may also have listened about printing ABS only with a printed bed. But what is the actual story?
You do need a heated bed when 3D printing with ABS material. But why is that so? ABS has the characteristic to contract more than other filaments.
Hence, the chances of warping become higher when printing with ABS. However, with the inclusion of a heated bed, the material finds it easy to attach to the bed surface, while reducing the chances for contraction.
Now, what about PLA. Do we require a heated bed or not? In the case of PLA, we do not always need a Heated Bed. However, if you wish to 3D print is longer, or the bottom surface is larger, it is better to use a heated bed to eliminate the chances of probable problems.
Not just that, you must also understand the optimal temperature that you must maintain when working with different materials.
For instance, when working with ABS, you must heat your print bed to 110°C. On the other hand, PLA can be settled for a lesser temperature of around 60°C.
It is very easy to set the temperature of the heated bed with the help of the 3D Slicer. So, you can make the changes as and when required.
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Caution to Take When Working with Heated Beds?
Heated beds are maintained at a very high temperature. Though we cannot get rid of them because of the many benefits they add to the printing process, we must take the necessary precautions to work around them.
Users must carefully avoid injuries by staying alert and following preventive measures.
These heated beds, when it comes in contact with the skin can end up leaving scars for life. These are very hot and you must avoid any direct contact with the print surface.
If you have kids around, you must take the necessary precautions when working with the 3D printers. If possible, you can go to the closed chamber.
This would anyway help to enhance the 3D print results by letting you maintain a consistent temperature around the build surface.
You may get yourself in other problems when the heated bed is not installed properly. In case, the legs of the bed aren’t positioned evenly, or the bed isn’t placed on a uniform surface, it would lead to imperfection in the 3D models.
It is a good idea to purchase the 3D printer with its own heated bed that comes with the package. This is to ensure that the two combos work together in harmony.
Or else, you may find it difficult to fit the parts from different vendors together because of the difference in the temperature gradient.
The Conclusion
It is a very common mistake that we make when avoiding to look for more details about the crucial components of the 3D printer. But we must not do that.
3D printers are expensive and before buying one, we must understand what we should look for, depending on our needs.
And, even if a 3D printer heated bed seems to be something not needed at the moment, it may help you stretch your goals later.
So, understand the benefits of the same and look for 3D printers that offer a heated bed already.
STL file Two wood 3D printer thermal bed holder only for bluer or blu3・Template for download and 3D printing・Cults
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