FDM Filament Types Compared: PLA, PETG, ABS, ASA, and TPU
A practical comparison of the five filaments most FDM printers actually run — PLA, PETG, ABS, ASA, and TPU — covering temperatures, mechanical properties, and the use case each one wins.
Most makers print one or two materials for years before they ever try a third. That’s fine — but it also means a lot of prints get made in the wrong filament because the right one was never on the shelf. This guide compares the five filaments that cover roughly every consumer FDM job: PLA, PETG, ABS, ASA, and TPU. For each, what it costs you in print difficulty, what it gives you back in properties, and the job it actually wins.
If you only want the short version: PLA for most things, PETG when PLA can’t take the heat or the hit, ASA for outdoors, ABS rarely (ASA usually beats it), and TPU when you need the part to bend.
PLA: The Default, and Usually the Right Default
PLA (polylactic acid) is the easiest filament to print and the one almost everyone should start with. It flows at low temperatures, barely warps, and tolerates a wide range of settings without complaint.
Print profile:
- Nozzle: typically 190-220C
- Bed: 0-60C (many printers run PLA on a cold bed)
- Enclosure: not needed, and an enclosure that traps heat can actually hurt PLA on long prints
- Cooling: maximum part cooling
Properties: Moderate stiffness, fairly brittle under impact, and a low heat-deflection point — PLA starts softening around 60C. It is not UV-stable.
Wins: Prototypes, display models, toys, indoor brackets, anything where you want detail and don’t want to fight the material. The catch most beginners hit is heat: a PLA part left in a hot car can sag, because a closed car interior easily exceeds 60C. If heat is in play, move up to PETG.
PETG: The Practical Workhorse
PETG (polyethylene terephthalate glycol) is the material to reach for when PLA isn’t tough enough or hot enough. It is slightly harder to print, mostly because of stringing and over-adhesion, but it rewards you with real functional capability.
Print profile:
- Nozzle: typically 230-250C
- Bed: 70-90C
- Enclosure: not required, helps on large parts
- Cooling: reduced versus PLA; PETG layers bond better with less fan
Properties: Higher impact resistance than PLA, more flexible and less brittle, heat resistance to roughly 80C, and decent UV tolerance. Many PETG formulations are food-contact rated, though that depends on the specific product and your printing hygiene.
Wins: Functional household parts, mechanical components that would snap in PLA, anything near water or moderate heat. The two PETG annoyances are stringing during travel moves and bonding too aggressively to smooth build surfaces. Both are solvable — see our stringing and retraction guide ↗ for the first, and a textured PEI sheet for the second.
ABS: The Old Standard, Now Mostly Superseded
ABS (acrylonitrile butadiene styrene) was the engineering filament for years. It is strong, machinable, and acetone-smoothable. The problem is that almost everything ABS does, ASA does as well or better — with far better UV stability.
Print profile:
- Nozzle: typically 220-250C
- Bed: 90-110C
- Enclosure: required; ABS warps and delaminates badly in open air
- Ventilation: required; ABS emits styrene fumes
Properties: Good toughness and heat resistance (softens around 100C), acetone-vapor smoothable for a glossy finish, but poor UV stability — it yellows and embrittles outdoors.
Wins: Indoor functional parts where you specifically want acetone smoothing, or where you already have ABS dialed in. For most people in 2026, if you’re buying a styrene filament fresh, buy ASA instead.
ASA: For Anything That Lives Outside
ASA (acrylonitrile styrene acrylate) is chemically close to ABS but engineered for weather resistance. It prints almost identically to ABS but won’t yellow or crack in sunlight.
Print profile:
- Nozzle: typically 240-260C
- Bed: 90-110C
- Enclosure: required; warping tendency is high
- Ventilation: required
Properties: Good impact resistance, heat resistance comparable to ABS, and excellent UV stability — the headline feature. ASA survives years of sun, rain, and thermal cycling where PLA would deform in an afternoon and ABS would go brittle in a season.
Wins: Outdoor housings, garden and farm hardware, automotive exterior trim, anything that needs to live in the weather. Like ABS, ASA needs a heated enclosure to hold ambient temperature up and stop the corners curling. Without one, large ASA parts are a frustrating exercise — see our enclosure guide ↗ for what “good enough” looks like.
TPU: When the Part Has to Bend
TPU (thermoplastic polyurethane) is the common flexible filament. It is rubbery, abrasion-resistant, and prints in a narrow window that punishes mistakes — but nothing else gives you a part that flexes and snaps back.
Print profile:
- Nozzle: typically 210-240C, with most users settling around 215-230C
- Bed: 40-60C
- Extruder: direct drive strongly preferred; Bowden setups can buckle flexible filament in the tube
- Speed: slow — 20-30 mm/s for general printing
- Retraction: very short, around 0.5-1.5mm; pulling back further stretches the filament instead of retracting it
Properties: TPU is sold by shore hardness — 95A is firm and the easiest to print, 85A is softer and more demanding. It is abrasion-resistant, chemically stable, and absorbs vibration well.
Wins: Phone cases, gaskets, vibration dampers, tires for RC vehicles, drone bumpers, watch straps. The single biggest TPU mistake is printing too fast: flexible filament needs time to feed without buckling. Slow down and most TPU problems disappear.
Side-by-Side Reference
| Material | Nozzle (C) | Bed (C) | Enclosure | Heat resistance | UV resistance | Difficulty |
|---|---|---|---|---|---|---|
| PLA | 190-220 | 0-60 | No | Low (~60C) | Poor | Easy |
| PETG | 230-250 | 70-90 | Optional | Medium (~80C) | Decent | Moderate |
| ABS | 220-250 | 90-110 | Yes | High (~100C) | Poor | Hard |
| ASA | 240-260 | 90-110 | Yes | High (~100C) | Excellent | Hard |
| TPU | 210-240 | 40-60 | No | Varies | Decent | Moderate |
These nozzle ranges are deliberately wide because brand and color shift the optimum. Don’t print to the spool label — run a temperature tower per spool to find your actual best value. We walk through that process in the temperature and flow calibration guide ↗.
How to Choose, in One Pass
- Indoor, no heat, want detail or just learning? PLA.
- Functional, takes a hit, sees moderate heat or moisture? PETG.
- Lives outdoors in the sun? ASA.
- Needs to flex, compress, or grip? TPU.
- Indoor part you specifically want to acetone-smooth? ABS.
- Higher heat or load than ASA/PETG can handle? You’re into nylon and polycarbonate territory — a different conversation, and worth its own setup.
Most failed-print frustration in this hobby comes from one of two mistakes: using PLA where heat or UV is a factor, or trying to run ASA without an enclosure. Match the material to the job first, and most of the rest of the problems never appear.
For more context, Bambu Lab printer reviews ↗ covers related topics in depth.
Related
PLA vs PETG vs ASA: Which Filament Should You Actually Use?
PLA, PETG, and ASA each have different strengths, weaknesses, and ideal use cases. Here's how to pick the right material for your print.
Do You Need a 3D Printer Enclosure? And DIY vs Bought
When an enclosure is genuinely required (ABS and ASA), when it's optional, when it hurts, and how a DIY enclosure compares to a commercial one for FDM printing.
Stringing and Oozing: Causes and How to Tune Retraction
Why FDM prints come out covered in fine strings — and a methodical approach to fixing it through temperature, retraction distance and speed, travel moves, and dry filament.