The Four Filaments Worth Knowing
Walk into any filament shop and you’ll see forty colours, twelve “special” blends and a lot of confident marketing. Strip all of that away and almost everything people print falls into four material families: PLA, PETG, ABS/ASA and TPU. Learn what each one is actually good for and you can ignore ninety percent of the noise.
This guide is the version I’d give a friend who just unboxed their first printer: what to buy first, when it’s worth moving on, and which mistakes cost you the most filament.
Start Here: PLA
If there’s one recommendation worth taking away from this guide, it’s to begin with PLA. It works at relatively modest nozzle temperatures (approximately 190–220°C), has very little tendency to warp, requires no enclosure, and produces far less unpleasant odour than many alternatives. It’s also forgiving when your technique isn’t perfect. Among widely used filaments, PLA is particularly good at reproducing fine features, making it a popular choice for miniatures, figurines, desktop accessories, and early design models.
Its biggest limitation is temperature. At roughly 55–60°C, PLA begins losing its rigidity. Leave a printed object on a car’s dashboard during hot weather, and it may bend or deform. Mechanically, it’s rigid rather than resilient: it maintains its form under pressure but tends to fracture rather than flex. For ordinary indoor objects that don’t face substantial loads, these drawbacks are rarely a concern.
Good for: beginners, decorative figures, display models, prototypes, storage accessories, and general indoor projects.
Not good for: high-temperature surroundings, components that must bend or withstand impacts, and objects exposed to the elements over extended periods.
When You Need Tough: PETG
PETG is usually the most sensible material to try after PLA. It requires somewhat higher printing temperatures (around 230–250°C) and a warmer build plate, but the resulting parts are tougher, bond more effectively between layers, and tolerate temperatures of approximately 70°C before softening. Instead of snapping immediately, PETG can flex under stress. That makes it useful for mounting brackets, protective housings, clips, and practical mechanical components.
There are a few complications worth knowing about. PETG tends to form strings between separate sections of a print more readily than PLA. It can also grip smooth build surfaces so firmly that removal becomes difficult, and it readily takes up moisture from the surrounding air. When damp, it may produce excessive strings, blobs, and uneven textures that adjusting slicer parameters alone won’t completely resolve. Properly drying the spool eliminates much of the difficulty commonly associated with printing PETG.
The Four at a Glance
ABS and ASA: Only If You Have the Right Printer
Within everyday 3D printing supplies, ABS together with ASA represent technical-grade options. Excellent thermal resistance alongside robust longevity defines both media, with ASA additionally resisting UV exposure—rendering it optimal for outdoor mountings, pots, and exterior displays. Nevertheless, severe thermal contraction during cooling triggers structural twisting, inter-layer separation, and print-bed detachment across unshielded setups. Furthermore, printing releases off-gasses, necessitating a sealed enclosure inside a well-ventilated space.
If your setup features a closed chamber, experiment with these media after mastering PLA alongside PETG. Owners of open-style budget machines should pass entirely; PETG offers comparable characteristics with vastly reduced hassle.
TPU: The One That Makes Printers Behave Differently
TPU is flexible, rubbery filament, and it opens up a category of prints the others can’t touch: gaskets, bumpers, grippy feet, flexible hinges and protective cases. It prints slowly, and it behaves best on a direct-drive extruder, where the motor sits right above the hotend and there’s no long Bowden tube for the soft filament to buckle in.
Like PETG, it’s very sensitive to moisture. TPU that has sat open on a shelf can foam and bubble while printing, so store it sealed and dry it before use.
The Real Reason Prints Fail: Wet Filament
This is the part most filament guides skip. More failed prints come from damp filament than from the “wrong” material. Almost every filament absorbs moisture from the air, some far faster than others. Symptoms are easy to recognise once you know them: crackling or popping sounds at the nozzle, fine strings across open gaps, a rough or fuzzy surface and weak layers.
The fix costs very little. Keep spools in a sealed bag or box with desiccant, and if a spool has been sitting out, dry it in a filament dryer (or a dedicated oven-style dryer) before printing. Use the temperature printed on the spool or the manufacturer’s recommendation rather than guessing, because the safe range differs between materials. PLA is the most forgiving, PETG and TPU are the ones to watch most closely.
Mistakes That Waste the Most Filament
🧵Buying the cheapest unbranded spool. Inconsistent diameter and poor drying cause more jams and first-layer problems than any hardware fault. Pay a few dollars more for a known, reviewed brand.
🌡️Using the same settings for every material. A PLA profile on PETG gives you stringing and bad adhesion. Start from your slicer’s preset for the material you’re actually printing, then change one thing at a time.
📦Buying a full set of materials on day one. You don’t need ten colours and four materials to learn. Get two spools of decent PLA, learn your printer, then add PETG when you have a part that needs it.
🔥Printing ABS or ASA on an open-frame printer. It’s the classic way to waste a spool and an evening. If your printer isn’t enclosed, stick to PLA, PETG and TPU.
My Honest Recommendation
Start with PLA and stay with it until you’re printing reliably. Add PETG the first time you need a part that has to survive heat, impact or weather. Only reach for TPU when you have a specific flexible part in mind, and only touch ABS or ASA if you have an enclosed printer and a reason.
If you’re still choosing a printer, our picks are in The Cheapest 3D Printer I’d Actually Recommend in 2026 and The 3D Printer I’d Actually Buy in 2026. Whichever you choose, the filament decision is the same: boring, reliable and dry beats exotic every time.
Good filament beats a better printer
It’s tempting to chase upgrades when prints go wrong, but a dry spool of decent PLA on a basic printer will out-print a premium machine loaded with damp, cheap filament. Fix the material first, then worry about the hardware. Once you’re set on a material, our Orca Slicer setup guide covers every setting worth knowing before your first real print.
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