A Comparison Between PETG and ABS
Acrylonitrile butadiene styrene, or ABS, was one of the first materials used in FDM 3D printing. One of the most popular polymers used today, it is utilized in injection molding to make everything from Lego bricks to airplane seats. This substance had reigned supreme as a general-use material until PLA arrived. The threat of PETG, or polyethylene terephthalate glycol, now extends to high-strength applications. The different PETG mixtures, sometimes known as "copolyesters," are said to strike the ideal balance between ABS's strength and PLA's usability.
How does the traditional ABS fare compared to this fresh batch of materials? Find out now.
The Materials in Detail
In filament-based 3D printing, ABS (Acetonitrile Butadiene Styrene) is one of the most often utilized materials. ABS is a significant engineering polymer for commercial and industrial items because it is robust and adaptable. It has good chemical resistance, is mechanically robust, can sustain high temperatures without deforming, and has a naturally glossy appearance. Yet, it has also developed a bad reputation as a challenging material in the 3D printing community. At relatively high temperatures, ABS prints. This makes ABS remarkably prone to warping when combined with a high thermal expansion coefficient. Many believe ABS printing is the "gatekeeper" to high-temperature 3D printing. For novices, dealing with ABS difficulties may be challenging.
PETG is a form of regular PET that has glycol added to it (Polyethylene Terephthalate). One scarcely needs an introduction to the value of PET because it is one of the materials used the most frequently for food and water containers. Comparing PETG to regular PET, all improvements are offered. It is more elastic, more resistant to exposure to high temperatures, and more chemically stable. Other than for food and drink containers, PETG is frequently used for prosthetic devices, outdoor signage, and medical equipment.
The best characteristics of ABS and PLA, two of the most popular materials for filament-based 3D printing, have frequently been compared to PETG. It is far more durable than PLA and doesn't have any of the problems with 3D printing that ABS does. PETG has been regarded as the "up and coming" filament that will eventually surpass ABS or PLA in popularity mostly because of this. Below is the comparison between ABS and PETG.
1. Factors Affecting the Ease of Usage
Warping, Melting, and Cracking
The fact that ABS doesn't like to stick, both to itself and to print surfaces, is one of its main issues. Beds that are heated to temperatures above 110 °C are essential. Also, heated build rooms, which may make or break prints, are included. Poorly heated prints will severely bend, deform, and tear off the build plate. They may even crack between layers. In these ways, PETG is significantly more forgiving. Compared to ABS, warping is still possible but significantly less common.
The range of 50 °C to 80 °C for the bed temperature is adequate for PETG printing. In reality, bed adhesion is frequently excessively strong, occasionally ripping chunks out of the build surface. This is readily fixed by spraying a release agent, such as glue or hairspray, on the build plate, which ensures successful prints. High fan speeds can cause parts to crack, and this is easily remedied. There is no need for a heated build chamber. All things considered, PETG makes it much simpler to succeed because it prevents many temperature-related print faults.
Temperature Requirements
As was previously mentioned, ABS has higher temperature requirements than PETG. Although the hot end temperatures needed for both materials are similar, ranging from 210 °C (for ABS) or 220 °C (for PETG) to 250 °C, ABS is significantly more sensitive to temperature changes than PETG, which is why a heated chamber is advised. Not all printers can maintain the temperature requirements for ABS. Heated build chambers are uncommon in printers. Fortunately, making your printer enclosures is rather simple.
Odor and Particle Emission
ABS has a major health risk due to its potential for printing scents ranging from mild to intense and heavy particle emission. A printer producing ABS parts shouldn't be in the same room as you. The fact that ABS emits toxic and very unpleasant fumes when printing is another factor in its infamy. In addition to being unpleasant, research has suggested that the styrene gas released by ABS may be carcinogenic. This also makes people exposed to high quantities of the gas feel queasy, nauseous, and sleepy. This does not imply that PETG printing is risk-free.
Any 3D printing procedure that involves heating and extruding plastic has the potential to release microplastics into the environment. These microplastics can be breathed and built up in a person's respiratory system. Many respiratory issues may develop over time due to frequent exposure to microplastics. However, PETG is considered the better option regarding safety and hazards in the work area.
Post-Processing Requirements
The flexibility of post-processing is where ABS excels. PETG and ABS can both be worked with common metalworking tools like taps and deburring tools, but ABS has a few further advantages. For example, while PETG is virtually tough to paint and glue, ABS is simple. This is crucial since PETG will quickly become difficult to handle regarding major areas you plan to revise cosmetically. ABS unquestionably has the advantage in post-processing.
Storge and Hygroscopicity of the Materials
PETG and ABS are both easily hygroscopic, absorbing environmental moisture. A spool of filament that would otherwise be OK can be destroyed by this dampness, degrading the substance.
2. Strength of the Material and Durability
-Strength of material: ABS is significantly weaker than PETG, as many users have discovered. While ABS tends to have worse layer adhesion, this is particularly true when loads are applied along the layer lines. The effectiveness of ABS in 3D printing applications has essentially become a myth since the introduction of newer materials. There is no justification for choosing it over PETG.
-Resistance to Ultraviolet radiation or durability in the sun: PETG will perform significantly better when exposed to the sun in the long run. UV light has little impact, especially when compared to ABS, which can drastically deteriorate. PETG is a material that will last a lot longer if you require it for outdoor use.
-Resistance to elevated temperatures: ABS has a minor advantage in temperature resistance. ABS can withstand temperatures as high as 105 °C, but PETG's glass transition temperature is around 80 °C. Only ABS will withstand boiling water, although PETG will last in most electronics applications due to the narrow margin. ABS unquestionably has a minor advantage when it comes to temperature resistance.
-Chemical stability: One of the modern polymers with the highest chemical stability is PETG, which contains glycol groups. However, ABS is selectively soluble in particular solvents, acetone being the most prominent. Due to PETG's exceptional chemical stability, it is now possible to use it to make medical implants, cosmetic and pharmaceutical packaging, and even medical gadgets. PETG is a material that is frequently used to create FDA-approved food storage containers. PETG is a fantastic material for 3D printing, something that will be in contact with corrosive substances, including acids, bases, oils, and solvents.
3. Factors Affecting Availability and Pricing of the Materials
Although ABS was once more prevalent, PETG has been supplanting it more and more. Moreover, the materials provide a few somewhat varied alternatives for color and blending. These are some variations you might experience.
-PETG: Due to its transparency, which is essential for building things like lampshades and vases, PETG used to be special. But ABS has now caught up, and several brands offer translucent white and colors. Many producers now provide PETG filaments and composites with PETG bases due to PETG's growing popularity among makers. PETG can be inexpensive or expensive, depending on how it is combined to increase strength or print quality.
-ABS: ABS' advantage has a cost. It often costs less per kilogram than PETG. Each spool will last you longer because ABS is lighter. Despite some brands having ABS filaments tailored for certain material qualities, ABS doesn't have as much variety as PETG options.
Which is the Right One for You?
There isn't much justification for most folks to pick ABS over PETG. PETG is more robust, long-lasting, and prints more effectively. Moreover, it comes in a vast selection of novelty and composite filaments. Only if you require ABS's temperature resistance or its ability to be painted and adhered to is necessary. Otherwise, it would be difficult to justify the printing challenges. If you are trying to print something that will be in the presence of stress from mechanical or chemical agents or even UV radiation, PETG is your best option.
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