Types of Filaments: PLA, ABS, PETG, TPU
When you’re comparing 3D printer filaments, the choice boils down to what you’re building. After testing over 10 filament types in our workshop, I can tell you that PLA, ABS, PETG, and TPU cover 90% of hobbyist and professional needs. Here’s how each one performs in real-world projects, with the strengths and weaknesses you actually care about.
PLA Filament
PLA is the go-to for beginners and decorative prints. It prints at low temperatures (190-220°C) without a heated bed, and it’s biodegradable—made from cornstarch. In my experience, PLA gives the cleanest surface finish on budget printers like the Ender 3. But don’t use it for anything that’ll sit in a hot car; it deforms above 60°C. For quick prototypes or cosplay props, PLA is king.
ABS Filament
ABS is the workhorse for functional parts that need to withstand heat or impact. It requires a heated bed at 100-110°C and an enclosure to prevent warping. The fumes are strong—ventilate your workspace. I’ve used ABS for drone frames and tool holders; it’s tough but finicky. If you’re printing mechanical gears or enclosures that see 80°C, ABS beats PLA hands down.
PETG Filament
PETG is the middle ground: easier than ABS, tougher than PLA. It’s food-safe (with proper nozzles) and resists water, UV, and chemicals. In our lab, PETG printed at 230-250°C with a bed at 70-80°C. The catch? It’s stringy and can stick too well to PEI sheets—use glue stick or tape. For outdoor signs or hydroponic parts, PETG is my pick.
TPU Filament
TPU brings flexibility to the table. It’s a thermoplastic polyurethane that bends without breaking. You’ll need a direct-drive extruder and slow speeds (20-30 mm/s) to avoid jams. I’ve printed custom gaskets and phone cases with TPU; the layer adhesion is solid if you dry it first. But it’s not for beginners—moisture and speed tuning can drive you crazy.
Testing in the DunaTech Lab
We put these filaments through real tests on three printers: an Ender 3 V2, a Prusa i3 MK3S+, and a Bambu Lab X1C. Here’s what we found when comparing 3D printer filaments side by side.
PLA: On the Ender 3, PLA printed flawlessly at 200°C with a 60°C bed. We made a 3D Benchy in 2 hours—no stringing, sharp overhangs. On the Bambu, it flew at 300 mm/s with the same quality. Perfect for decorative pieces and quick prototypes. In our tests, PLA performed well even on budget printers, but avoid it for load-bearing parts.
ABS: We printed electronic enclosures on the Prusa with an enclosure. The resistance was excellent—no warping at 105°C bed temp. But mandatory ventilation is required; the styrene fumes gave me a headache after 30 minutes. For functional parts like brackets, ABS is unbeatable, but you need a setup.
PETG: Ideal for functional parts. In a water resistance test, printed pieces showed no degradation after 72 hours submerged. We printed a custom phone mount at 240°C; it held a heavy phone without sagging. The only issue was bed adhesion—we switched to a textured PEI sheet and it stuck perfectly.
TPU: Although challenging to handle, we successfully printed phone cases with great flexibility using low speeds (30 mm/s). On the Bambu, we used the «Silent» mode to reduce vibrations. The case stretched over a Samsung S23 without cracking. But if your filament is wet, expect bubbles and failed layers.
Common Mistakes When Using Filaments
Honestly, most problems we’ve seen in our workshop are not the fault of the filament itself but improper use. When you’re comparing 3D printer filaments, knowing these pitfalls saves you hours of frustration. Here are the most frequent mistakes with concrete symptoms, causes, and fixes.
Incorrect temperature: Using too high a temperature with PLA can cause extruder clogs. Symptom: filament oozes out before printing, or the extruder skips steps. Cause: you’re printing PLA at 230°C when 200°C is enough. Fix: run a temperature tower (e.g., 190-220°C in 5°C steps) to find the sweet spot. For PETG, too low (below 220°C) causes poor layer adhesion—bump it to 240°C.
Moist filament: If the filament is moist (especially ABS and PETG), prints will have bubbles, popping sounds, or a rough surface. Cause: humidity absorbed from the air—common in coastal areas or rainy seasons. Fix: dry the filament at 50-60°C for 4-6 hours in a filament dryer like the Sovol. I keep my spools in a sealed box with silica gel. If you hear crackling mid-print, stop and dry it.
Improper print speed: TPU requires low speeds to avoid errors. Symptom: the extruder grinds the filament, or you get underextrusion. Cause: printing TPU at 60 mm/s when it needs 20-30 mm/s. Fix: slow down to 25 mm/s, disable retraction, and use a direct-drive extruder. For ABS, fast speeds (over 60 mm/s) cause warping—drop to 40 mm/s for better layer bonding.
Bed adhesion issues: PETG sticks too well to glass or PEI, causing damage. Symptom: the print won’t come off, or you tear the bed surface. Fix: use a glue stick or painter’s tape as a release layer. For ABS, use a brim and an enclosure to prevent corners lifting.
For more tips on handling moist filaments, check out our guide on how to use a Sovol filament dryer.
Frequently Asked Questions
What is the best filament for beginners?
Without a doubt, PLA is the easiest to use. It doesn’t require a heated bed or complicated adjustments. I recommend starting with PLA at 200°C and a 60°C bed for consistent results.
How can I tell if my filament is moist?
If you hear small crackling sounds during printing or see bubbles in the layers, your filament is likely moist. Another sign: the filament snaps easily when bent. Dry it at 50°C for 4 hours to restore quality.
What temperature should I use for TPU?
Generally between 220°C and 240°C, but adjust according to the manufacturer’s recommendations. For flexible TPU (Shore 85A), start at 230°C. For harder TPU (Shore 95A), 240°C works better. Always run a temperature tower first.
Can I print ABS without an enclosure?
Technically yes, but you’ll get warping and poor layer adhesion. An enclosure keeps the ambient temperature stable (around 40-50°C) and reduces fumes. If you must print without one, use a brim and slow down to 30 mm/s.
Which filament is best for outdoor use?
PETG is my top pick for outdoor projects. It resists UV, water, and temperature swings better than PLA. ABS also works but degrades in direct sunlight over time. For marine environments, PETG is the safest bet.
Conclusion
Choosing the right filament depends on your project. For beginners, PLA is ideal. If you need durability, ABS or PETG are better options. And for flexible parts, TPU is a safe bet. Always keep your filaments dry and carefully adjust printing parameters to avoid issues. When comparing 3D printer filaments, remember: there’s no single best material—only the right one for your specific use case. Happy printing!
— The DunaTech Team