PLA — The Standard Starting Point
Polylactic acid is the default filament for most 3D printer users and for good reason: it prints easily, needs no heated chamber, has minimal warping, and is biodegradable. It is made from fermented plant starches — corn starch, sugarcane — rather than petroleum, which gives it its eco-friendly reputation, though industrial composting conditions are required for actual biodegradation.
PLA prints at 190–220°C on a bed at 40–60°C. It has good bed adhesion and low shrinkage, making it the most forgiving filament for getting a successful print on the first attempt. Almost every FDM printer ships with PLA profiles as the default recommendation.
The limitations are real. PLA is not food-safe (the polymer absorbs moisture and bacteria), it softens at 60°C (leaving it in a parked car in summer will deform prints), and it is brittle. PLA parts snap under impact rather than flex. For functional parts that endure stress or heat, PLA is the wrong choice.
Best for: Prototypes, models, decorative prints, test prints for fit, cosplay props, architectural models, any project where the print will live indoors in stable conditions.
Our mini 3D printers guide covers which printers are best suited for PLA and other filaments in compact form factors.
PETG — The Practical All-Rounder
PETG (Polyethylene Terephthalate Glycol) is the filament that most experienced users eventually settle on for functional prints. It offers a useful balance: stronger and more heat-resistant than PLA, more flexible and less brittle, and significantly more food-safe than PLA in its pure form — though moisture sensitivity means food-contact use still requires careful evaluation of the specific filament brand.
PETG prints at 230–260°C on a bed at 70–90°C. It requires a heated bed and ideally an enclosure to maintain consistent layer adhesion. PETG is prone to stringing (thin webs of filament between printed sections) because it stays viscous longer as it exits the nozzle. Careful retraction settings and a well-tuned profile solve this — it is not an inherent flaw of the material so much as a sign that the printer profile needs attention.
PETG absorbs moisture from the air faster than most filaments — a spool left open for a few days in a humid environment will produce steam and print defects. Dry boxes or spool bags with desiccant are effectively mandatory for consistent PETG results. Store opened PETG spools in airtight bags with silica gel packets.
Best for: Functional parts, outdoor-use prints (it tolerates temperature and UV better than PLA), protective phone cases, brackets, mechanical components, any print that needs both impact resistance and some flex.
For more on choosing the right 3D printer for these materials, see our CNC routers vs 3D printers comparison — which also covers when a different manufacturing method is more appropriate than filament-based printing altogether.
ABS — High Performance, High Fuss
Acrylonitrile Butadiene Styrene is the filament of functional ambition. It is stronger, more heat-resistant, and more impact-resistant than PETG — a properly printed ABS part can withstand meaningful mechanical stress in ways that PETG and PLA cannot. It is the same material used in LEGO bricks and automotive interior trim.
ABS prints at 230–260°C on a heated bed at 90–110°C, and it requires a heated enclosure or chamber. Without one, the print cools too quickly between layers, causing layer delamination, warping, and the classic elephant-foot distortion at the base. Getting good ABS prints consistently means printing in a controlled environment — a closed-frame printer with enclosure heating, or a fully enclosed chamber.
ABS also emits styrene fumes during printing, which are toxic in sufficient concentration. Printing ABS in a well-ventilated space with an air filter or ducted exhaust is non-optional. Hobby-grade printers without enclosure heating or active filtration are genuinely not ideal environments for ABS.
Best for: Functional engineering prototypes, high-heat environments (ABS stays rigid up to 95°C), automotive and aerospace-grade prototypes, parts that need to be acetone-smoothed or chemically welded.
TPU — Flexible Prints That Last
Thermoplastic Polyurethane is a flexible filament — not rubber, but the closest thing to rubber that FDM printing handles well. TPU parts flex under pressure and return to their original shape. They resist abrasion, handle repeated flex cycles without cracking, and are notably more impact-resistant than rigid filaments.
TPU prints at 220–250°C with minimal bed heat (30–60°C). The printing challenge is not temperature but speed: TPU must be printed slowly, typically at 20–30mm/s feed rate. Printing too fast causes filament grinding, jams, and layer adhesion failures. If your printer's filament path has any resistance — a long PTFE tube, a tight Bowden tube bend — TPU will expose it.
Direct drive extruders handle TPU significantly better than Bowden setups because the short distance between extruder gear and nozzle means less opportunity for the filament to buckle. If TPU printing is important to you, a direct drive extruder is worth the upgrade.
Best for: Phone cases, cable guards, seals, gaskets, flexible hinges, footwear outsoles, any part that needs to bend, absorb impact, or flex repeatedly. Our precision screwdriver sets guide covers tool design and storage cases where TPU's flexible properties are genuinely useful for custom organizer inserts.
Nylon — The Strongest Common Filament
Nylon (PA6 and PA12 grades are the most common in filament form) is the strongest and most durable filament available for consumer FDM printing. It has exceptional tensile strength, high impact resistance, and genuine toughness — a nylon part behaves more like machined engineering plastic than a printed part.
It is also the most demanding filament to print successfully. Nylon prints at 240–270°C on a heated bed at 70–100°C. It is extremely hygroscopic — absorbing water aggressively from the air — and prints with steam rather than clean extrusion if not thoroughly dried. A dry box during printing is mandatory. Post-print, nylon parts absorb moisture and may distort over time if not stored properly.
Warping is significant in nylon prints; a textured or spring steel print surface is typically required for adequate first-layer adhesion. Nylon also has high thermal expansion — it grows slightly as it heats inside the hot end, which can cause diameter inconsistencies if the filament path is not well-managed.
Best for: Functional mechanical parts, tools, brackets, structural components, outdoor-use parts, end-use parts that need to replace machined components in low-stress applications. Not for beginners, not for short-run prototyping where material handling effort outweighs the benefit.
ASA and PVB — Outdoor Alternatives to ABS
ASA is effectively a UV-resistant version of ABS. It shares ABS's mechanical properties and printing requirements — heated enclosure, high bed temp, similar emission considerations — but does not yellow or degrade under UV exposure. It is the filament of choice for outdoor functional parts. The main drawback: ASA is significantly more expensive than ABS, and some ASA formulations emit more fumes than ABS during printing.
PVB is a filament designed primarily for aesthetic printing. It prints similarly to PETG, dissolves in isopropyl alcohol (IPA), and produces prints with a smooth, glossy surface when post-processed with IPA vapour smoothing. If you want printed parts with a smooth, injection-moulded appearance, PVB is the route. The trade-off is cost and the extra post-processing step.
The Bottom Line
The filament you already have loaded is your best filament for most projects. But knowing when to reach for something different is what separates experienced makers from people who keep breaking PLA parts.
Build a material toolkit: PLA for prototypes and decorative work, PETG for functional prints around the house and workshop, TPU for anything that needs to flex, ABS or ASA only when heat resistance or outdoor durability genuinely requires it. Leave Nylon for the projects where nothing else will hold — and budget the time to dry it properly before you start.
The printer profile matters as much as the material. A well-tuned profile for PLA will still produce poor results from PETG if you haven't adjusted retraction, temperature, and print speed. Save printer profiles for each material you use regularly — the ten minutes you spend tuning a PETG profile will save hours of failed prints.