Filament for a 3D printer is the main consumable material used in FDM/FFF printing technology. The correct choice of filament directly affects part strength, appearance, durability and printing convenience. Despite the abundance of names and marketing terms, all filaments solve specific practical tasks.
This article is a detailed and easy-to-understand guide to the main types of filaments for 3D printing. It is optimized for SEO queries and is suitable both for beginners and for those who use 3D printers for business purposes.
What is 3D printer filament?
Filament is a plastic strand, most commonly with a diameter of 1.75 mm, which is fed into the 3D printer extruder, melted and deposited layer by layer.
Different types of filaments differ by:
- printing temperature;
- strength and flexibility;
- resistance to moisture, ultraviolet light and heat;
- printing complexity and equipment requirements.
PLA – the most popular filament for 3D printing
PLA is considered the entry point into the world of 3D printing and is most commonly used by beginners and in commercial souvenir production. This filament is valued for its predictable results and minimal printer setup requirements. PLA is well suited for highly detailed models where appearance matters more than mechanical strength. Thanks to its wide availability and low price, PLA remains the best-selling filament on the market.
PLA (Polylactic Acid) is the most widely used material for FDM printing.
Main characteristics of PLA:
- low printing temperature (180–220 °C);
- minimal shrinkage;
- no strong odor;
- high level of detail.
PLA performs poorly at temperatures above 55–60 °C and under impact loads, making it suitable primarily for indoor and decorative products.
PLA applications:
- decorative models and figurines;
- prototypes and mockups;
- indoor electronic enclosures;
- souvenir and commercial products.
PETG – universal filament for functional parts
PETG is often called the “golden middle” between PLA and ABS. It combines relative ease of printing with noticeably better mechanical properties and moisture resistance. This filament is chosen when a part needs to be strong but without the complexity typical of engineering plastics. PETG is especially popular in small-batch production and home-based businesses.
PETG is a modified polyethylene terephthalate that combines ease of printing with increased strength.
PETG properties:
- high impact resistance;
- moisture resistance;
- operating temperature up to approximately 80 °C;
- good layer adhesion.
PETG is often chosen as a replacement for PLA for parts with moderate loads.
Where PETG is used:
- brackets and holders;
- containers and enclosures;
- parts for humid environments;
- household and semi-industrial products.
ABS – technical plastic with high heat resistance
ABS is a classic engineering filament that was widely used in industry long before consumer 3D printers appeared. It is chosen for its combination of strength, impact resistance and high-temperature stability. Under proper printing conditions, ABS allows the production of durable and repairable parts. However, it requires more experience and an enclosed printer.
ABS (Acrylonitrile Butadiene Styrene) was for a long time the standard in technical 3D printing.
Key features of ABS:
- high impact strength;
- heat resistance up to 100 °C;
- possibility of acetone post-processing.
ABS requires an enclosed printer and stable temperature, as it is prone to warping.
ABS applications:
- technical enclosures;
- load-bearing elements;
- parts requiring sanding and bonding.
ASA – the best filament for outdoor use
ASA was developed as a response to the main drawback of ABS – low resistance to ultraviolet radiation. This filament retains its mechanical properties and color during prolonged outdoor use. It is often used in projects where parts are constantly exposed to sun and rain. ASA is considered the optimal choice for outdoor and automotive applications.
ASA is an improved version of ABS with increased UV resistance.
Advantages of ASA:
- resistance to sunlight and weather conditions;
- high mechanical strength;
- dimensional stability during use.
Where ASA is used:
- outdoor mounts;
- sensor and camera housings;
- automotive parts;
- engineering projects.
TPU – flexible filament for elastic products
TPU opens up possibilities for 3D printing in the segment of flexible and shock-absorbing parts. Unlike rigid plastics, it can stretch and return to its shape without breaking. This filament is actively used where protection against impacts and vibrations is required. TPU is in demand both in household products and in industrial printing.
TPU belongs to the group of thermoplastic elastomers.
Main properties of TPU:
- high flexibility;
- abrasion resistance;
- good impact toughness.
TPU is more difficult to print, especially on printers without a direct-drive extruder.
TPU applications:
- cases and protective elements;
- gaskets and seals;
- shock-absorbing parts;
- feet and dampers.
Nylon (PA) – engineering filament
Nylon belongs to the class of professional materials for 3D printing and is used where conventional plastics are insufficient. It offers high strength, wear resistance and good antifriction properties. Nylon is often used to replace cast or machined parts in small batches. This filament requires experience but delivers outstanding results.
Nylon (PA6, PA12 and blends) is a material for mechanically loaded parts.
Nylon characteristics:
- high strength and wear resistance;
- low coefficient of friction;
- higher heat resistance than PETG.
Nylon strongly absorbs moisture and requires mandatory drying.
Where Nylon is used:
- gears;
- plain bearings;
- mechanical assemblies;
- industrial 3D printing.
Composite filaments (Carbon, Glass, Wood)
Composite filaments are created based on standard plastics with the addition of various fillers. They allow properties that are not available in conventional materials, such as increased stiffness or decorative texture. These filaments are especially popular in engineering and design projects. When working with composites, it is important to consider increased nozzle wear.
Composite filaments contain fillers that modify the properties of the plastic.
Main types:
- Carbon Fiber – increased stiffness and dimensional stability;
- Glass Fiber – balance of cost and strength;
- Wood / Metal Fill – decorative materials with visual effect.
Printing composite filaments requires a hardened nozzle.
Comparison table of 3D printing filaments
| Filament | Ease of printing | Strength | Heat resistance | Outdoor use | Flexibility | Main application |
|---|---|---|---|---|---|---|
| PLA | Very high | Low | Low | No | No | Decoration, prototypes |
| PETG | High | Medium | Medium | Limited | Low | Functional parts |
| ABS | Medium | High | High | No | Low | Technical products |
| ASA | Medium | High | High | Yes | Low | Outdoor parts |
| TPU | Low | Medium | Medium | Yes | High | Elastic products |
| Nylon | Low | Very high | High | Yes | Low | Engineering parts |
How to choose a filament for 3D printing
Selection algorithm:
- If ease and appearance are needed – PLA.
- If versatility is needed – PETG.
- For outdoor use and sun exposure – ASA.
- For flexible parts – TPU.
- For mechanical load – Nylon.
Conclusion
3D printing filaments are not a matter of “better or worse”, but of suitability for the task. A correctly selected material saves time, money and effort, and allows predictable results both in hobby projects and in commercial 3D printing.
Understanding the properties of PLA, PETG, ABS, ASA, TPU and Nylon covers more than 90% of tasks in FDM printing.
