ABS and PLA filaments are widely known in the 3D printing universe, but there are important advantages of PETG filament in 3D printing that are causing it to quickly growing as a popular option for builds. The properties of PETG make it an appropriate choice for producing a vast array of impact-resistant and flexible items.
CompositionPETG is a modified form of polyethylene terephthalate (PET), a thermoplastic widely used in plastic bottles. In fact, 43 percent of U.S. soft drinks are delivered in PET bottles. Glycol-modified PET (PETG) is an increasingly popular filament material because it's more durable than common alternatives. The addition of glycol prevents crystallization so it won't become brittle when heated. PETG is a highly transparent co-polyester that can be dyed as required. It is possible to produce brightly colored, translucent prints with a nice, glossy finish with minimal post-processing.
AdvantagesAs the 3D printing industry matured, PETG emerged as a viable and attractive alternative to ABS and PLA. Here are some of the qualities that drive interest in this advanced filament material:
- Excellent layer adhesion
- Warp resistance
- Reduced shrinkage
- Higher density
- Chemical resistance to both acidic and alkali compounds
- Flexible printing on glass, acrylic, glass, blue tape and polyimide tape
- Odorlessness during printing
Versatile ApplicationsPETG is worth considering any time your 3D print needs to be tough, durable, flexible and impact-resistant. It is ideal for use in the production of a wide array of mechanical parts. The rapidly expanding robotics technology sector is also embracing PETG printing. The smooth finish of PETG prints, and the fact that the plastic is FDA-compliant makes it an appropriate choice for printing creative and/or intricate kitchenware designs. You are really only limited by your imagination. Enterprises looking for a filament that will produce translucent, shatter-resistant items like phone cases will also want to take a close look at using PETG filament.
Filament ComparisonsPETG filament favorably compares to other popular 3D printing materials:
- PLA/PHA filament -- Polylactic (PLA) is a biopolymer commonly derived from cornstarch and sugarcane. PETG print speeds are similar to those of PLA, although the melting point is higher. Like, PETG, PLA and PHA filaments are relatively easy to use. However, PETG is denser (1.38g/cm3).
- ABS filament -- Acrylonitrile-Butadiene Styrene (ABS) is temperature-resistant like PETG. While ABS is harder, PETG is more flexible and more durable. PETG is odorless during printing, while ABS emits a noticeable odor.
- TPU filament -- Thermoplastic Polyurethane (TPU) is not as dense as PETG; the density of flexible TPU filament is just 1.21g/cm3. The chemical resistance of TPU is good, while the chemical resistance of PETG is excellent.