When it comes to 3D printing, the choice of material can significantly impact the final product. Two popular materials in the 3D printing world are PLA(PolyLactic Acid) and PETG (Polyethylene Terephthalate Glycol-modified). Each has its unique properties, advantages, and disadvantages. PLA is more stiffness and brittle than PETG. PETG is more durable and resistance-temp than PLA.

PLA

PLA is the most often using 3D printer filament. It is made from biological material. PLA is a polymer of lactic acid and easy to biodegrade. It get popular in 3D printing users as its easy to 3D print and the cheap cost.

Characteristics:

PLA is a biodegradable thermoplastic made from renewable resources like corn starch or sugarcane.

It's known for its ease of use and minimal warping during printing.

PLA has a relatively low printing temperature, typically around 180-220°C, making it compatible with a wide range of 3D printers.

It comes in a variety of colors and is well-suited for detailed and intricate prints.

PLA has a glossy finish and is often chosen for artistic and decorative prints.

Advantages:

Ease of Printing: PLA is beginner-friendly and ideal for those new to 3D printing due to its minimal printing issues.

Biodegradable: PLA is an environmentally friendly option, as it breaks down naturally over time.

Print Precision: PLA is better suited to maintaining part precision due to its better printability and lower warping. However, under steady load, PLA tends to creep. For smaller features, PETG bonds better as it is more viscous in the melt state.

Disadvantages:

Limited Heat Resistance: PLA has a lower heat tolerance compared to some other materials, making it unsuitable for high-temperature applications.

Brittleness: While it's relatively strong, PLA can be brittle, making it less suitable for parts subjected to high stress.

PETG

PETG, or polyethylene terephthalate glycol, is a thermoplastic polymer resin often used for 3D printing filament. PETG consists of long polymer chains made up of repeating ethylene terephthalate units. The G is for glycol. Its structure includes aromatic benzene rings linked with ester groups to aliphatic ethylene glycol units. This arrangement of stiff aromatic rings and flexible ethylene glycol chains gives PETG its unique properties and processability.

Characteristics:

PETG is a tough, durable, and recyclable thermoplastic.

PETG is more strong and resilience than PLA. So it is suit for function parts 3D printing such as Drone.

It offers excellent layer adhesion, reducing the risk of delamination during printing.

PETG has a higher printing temperature range, typically around 220-250°C, making it suitable for functional parts.

It has good chemical resistance and is moreprone to moisture absorption than PLA.

PETG prints often have a semi-gloss or matte finish.

Advantages:

Durability: PETG is stronger and more impact-resistant than PLA, making it suitable for mechanical parts and functional prototypes.

Temperature Resistance: It can withstand higher temperatures, making it suitable for objects exposed to heat or outdoor use.

Chemical Resistance: PETG is less susceptible to chemical degradation than PLA.

Transplant: PETG can make highly transparent object like fruit juice bottle.

Disadvantages:

Adhesion to Build Plate: PETG can be prone to sticking too well to the build plate, which may require extra care when removing prints.

Printing Challenges: It may be less forgiving than PLA when it comes to issues like stringing or overhangs.

Easy stringing: PETG often causes stringing because it needs high temperatures to flow well. In order to avoid PETG stringing during the printing process, you need to adjust the parameter settings for 3D printing and even do a lot of printing test work.

Cost: PETG typically costs between $20 to $25 per kg, making it more expensive than PLA due to its higher manufacturing cost and more advanced properties. However, while PLA is cheaper, it may not always be the most cost-effective option as it is not as durable as PETG and may need to be replaced more frequently.

Choosing Between PLA and PETG

The choice between PLA and PETG ultimately depends on your specific 3D printing needs:

Choose PLA If: You are a beginner looking for easy-to-print, environmentally friendly material for artistic or decorative prints. PLA is also a great choice for educational purposes and for models not exposed to extreme conditions.

Choose PETG If: You need durable, functional parts that can withstand higher temperatures and mechanical stress. PETG is a versatile material suitable for a wide range of applications, including mechanical components, enclosures, and outdoor use.

PETG VS PLA