3D printer filament: the six families and how to choose

Q: What is the most common 3D printer filament?

PLA. It prints at a low nozzle temperature around 190 to 220 C, sticks to almost any bed without heat or enclosure, and costs less than most alternatives. It is the default for new printers and for parts that do not face heat or load.

Q: Is 3D printer filament food safe?

Not as printed. The plastic pellets can be food-contact grade, but the layer lines trap bacteria and the brass nozzle can leave lead, per UltiMaker food-safety guidance. Use a food-grade coating, a stainless-steel nozzle, and wash the part, or treat printed items as not food safe.

Q: Can I print ABS without an enclosure?

Small parts sometimes work, but ABS shrinks as it cools and lifts off the bed without a warm enclosure. For anything larger than a test cube, enclose the printer and heat the bed to about 100 to 110 C.

Q: How long does filament last?

Stored dry in a sealed bag with desiccant, most filament lasts a year or more. Left open in a humid room, PETG, nylon, and TPU absorb water in days and print poorly. PLA is more forgiving but still lasts longest sealed.

Short answer

3D printer filament is the plastic a fused-filament printer melts and lays down, one layer at a time. Almost every desktop machine runs one of six material families, and each trades ease of printing against strength, heat resistance, and flexibility. Pick the family first, then the brand.

01 The six material families

Most printing happens in six plastics. PLA and PETG cover the majority of hobby and light-functional work. ABS and ASA add heat and weather resistance but need a warm, enclosed printer. TPU bends instead of breaking. Nylon is tough and low-friction but hungry for moisture.

The six common 3D-printer filament families compared
Material	Best for	Watch out
PLA	Models, prototypes, low-stress parts	Softens near 55 to 60 C; not for hot cars or sun
PETG	Tough parts, mild outdoor use, watertight vessels	Strings when wet; dry before printing
ABS	Functional, heat-resistant parts	Warps without an enclosure; gives off fumes
ASA	Outdoor parts; resists UV sunlight	Same fumes and enclosure needs as ABS
TPU	Bumpers, gaskets, phone cases, tires	Prints slow; wants a direct-drive extruder
Nylon	Gears, living hinges, tough mechanical parts	Absorbs moisture fast; dry it and store it sealed

Ratings are relative starting points, not lab results. Marqilo has not tested these materials at launch.

Specialty rolls build on the same bases. Wood-fill and silk PLA change the look of PLA. Carbon-fiber-filled nylon and polycarbonate add stiffness and heat resistance, and the abrasive fibers wear a standard brass nozzle, so switch to hardened steel. The PLA vs PETG comparison breaks down the two most common choices in more depth.

02 How to choose

Match the part to the material, not the other way around. A desk mascot prints in PLA. A part that lives in a hot car or carries load wants PETG, ABS, or nylon. Something that must flex wants TPU. Start from the job, narrow to one family, then read its settings page before you print.

03 Diameter, tolerance, and quality

Desktop filament comes on two sizes. The 1.75 millimeter diameter is the near-universal standard. The 2.85 millimeter (sometimes labeled 3.00 millimeter) size fits older Bowden machines. Mixing them breaks a print, so check what your extruder takes before you buy.

What to check on a roll4 specs

Diameter

1.75mm

The desktop standard. 2.85 mm fits older Bowden printers.

Tolerance

+- 0.03mm

Tighter tolerance feeds more evenly. Cheap rolls list +- 0.05 mm or none at all.

Dryness

< 0.4% H2O

Wet filament pops and strings. Dry PETG, nylon, and TPU before use.

Spool weight

1.0kg

The standard net weight. Some value rolls sell 0.75 kg or 0.5 kg.

Tolerance matters more than brand. A roll that varies between 1.60 and 1.85 millimeters under-extrudes and over-extrudes across the same print. Look for a stated tolerance of plus or minus 0.03 millimeters or tighter, and store every roll dry. The filament storage guide covers bags, desiccant, and dryers.

04 Safety: fumes and ventilation

ABS, ASA, and nylon release ultrafine particles and volatile organic compounds as they melt. The Chemical Insights Research Institute counts more than 200 VOC species from a heated printer, and peer-reviewed work in Frontiers in Toxicology shows ABS emits more than nylon or PLA. The CDC and NIOSH list ventilation and filtration at the top of their control list for 3D-printer emissions.

What is the most common 3D printer filament?

PLA. It prints at a low nozzle temperature around 190 to 220 C, sticks to almost any bed without heat or enclosure, and costs less than most alternatives. It is the default for new printers and for parts that do not face heat or load.

Is 3D printer filament food safe?

Not as printed. The plastic pellets can be food-contact grade, but the layer lines trap bacteria and the brass nozzle can leave lead, per UltiMaker food-safety guidance. Use a food-grade coating, a stainless-steel nozzle, and wash the part, or treat printed items as not food safe.

Can I print ABS without an enclosure?

Small parts sometimes work, but ABS shrinks as it cools and lifts off the bed without a warm enclosure. For anything larger than a test cube, enclose the printer and heat the bed to about 100 to 110 C.

How long does filament last?

Stored dry in a sealed bag with desiccant, most filament lasts a year or more. Left open in a humid room, PETG, nylon, and TPU absorb water in days and print poorly. PLA is more forgiving but still lasts longest sealed.

For a deeper look at one material, read the PETG guide or the how to print ABS walkthrough. The filament glossary entry defines the term in plain language.

Related guides

Sources & methodology

5 citations · reviewed 2026-07-09

01CDC/NIOSH Science Bulletin: 3D-printing emissions and controlsaccessed 2026-06-29Tier 1
02Chemical Insights Research Institute (UL): 3D printing emissionsaccessed 2026-06-29Tier 1
03Kim et al., Frontiers in Toxicology (2022): ABS VOC and ultrafine-particle measurementaccessed 2026-06-29Tier 1
04All3DP: 3D-printing fumes and air qualityaccessed 2026-06-29Tier 2
05UltiMaker: is PLA food safe? A guide to food-safe 3D printingaccessed 2026-06-29Tier 2

How we vetted this: every claim traces to a tiered source, Tier 1 (manufacturer, slicer, standards) first. Read the full sourcing and conflict-of-interest policy.