PLA_VS_PETG
ABS_VS_TPU

Polylactic acid is the filament that ships with nearly every printer for good reason: it prints at lower temperatures, rarely warps, produces minimal odor, and delivers sharp surface detail. If you are running your first 3D printer, PLA is where you start — no exceptions.

The material comes from fermented plant starch (usually corn), which gives it biodegradable credentials that no petroleum-based plastic can match. In practice, this matters less than you think — PLA does not compost in your backyard. Industrial composting facilities running at 58°C+ can break it down, but a PLA part sitting on your shelf will last decades.

Where PLA fails is heat resistance. Glass transition temperature sits around 55-60°C. Leave a PLA phone mount on your car dashboard in summer and it will sag within hours. Functional parts that see sustained temperatures above 50°C need PETG or ABS instead.

PLA+ and PLA Pro variants add impact modifiers that increase toughness by roughly 30-40% over standard PLA. The trade-off is slightly higher nozzle temperatures (210-230°C) and marginally more stringing. For functional PLA parts, PLA+ is worth the extra cost — we compared the specific differences in our PLA vs PLA+ breakdown.

Our top PLA picks: Hatchbox PLA filament for consistent quality across 20+ colors, and eSUN PLA+ filament for functional parts that need extra impact resistance.

Polyethylene terephthalate glycol-modified sits in the sweet spot between PLA's ease and ABS's durability. It resists impacts better than PLA, handles temperatures up to 80°C, and remains nearly as printable. If you could only own two filaments, PLA and PETG would cover 90% of use cases.

The glycol modification separates PETG from regular PET (the stuff water bottles are made from). That chemical tweak eliminates crystallization during cooling, which means less warping and better layer adhesion. You get a clear, glossy material that bends before breaking — the opposite of PLA, which snaps clean.

PETG's biggest enemy is moisture. The material is hygroscopic — it absorbs water from ambient air. Wet PETG produces popping sounds during extrusion, visible bubbles on the print surface, and strings that make your print look like it grew hair. Dry your spools. A 4-6 hour session at 65°C in a filament dryer fixes most moisture problems. The Anycubic Kobra S1 Combo is the only printer with a built-in filament dryer — a genuine advantage for hygroscopic materials.

Bed adhesion with PETG is a double-edged sword. The material bonds aggressively to smooth PEI sheets — so aggressively that it can rip surface coating off if you don't let the bed cool completely before removing prints. Use the textured PEI side (most modern printers include dual-sided plates) or apply a thin layer of glue stick as a release agent.

PETG is the outdoor filament.

UV resistance makes it the default choice for any part exposed to sunlight. Unlike ABS, which yellows and becomes brittle after months of UV exposure, PETG maintains structural integrity outdoors for years. Garden tool holders, mailbox fixtures, outdoor enclosure parts — PETG handles them all without degradation.

Acrylonitrile butadiene styrene was the original 3D printing filament and it remains the go-to for heat resistance. With a glass transition temperature around 100°C, ABS parts survive environments that destroy PLA and push PETG to its limits. Engine bay brackets, electronics enclosures near heat sources, anything that sits near a running motor — ABS territory.

The catch is that ABS demands an enclosed printer. Without enclosure, the material warps catastrophically. Ambient temperature changes during printing cause differential cooling across layers, and ABS's high shrinkage rate turns this into curled corners, cracked layers, and prints that pop off the bed mid-job. The Bambu Lab P2S with carbon filter, Prusa Core One enclosed chamber, and Bambu Lab X1 Carbon all have enclosed chambers with active filtration designed for ABS.

Fumes are the other factor. ABS emits styrene during printing — a known irritant that can cause headaches and respiratory issues with prolonged exposure. An activated carbon filter handles most of it, but printing ABS in a bedroom is a bad idea regardless. If you need heat-resistant parts and want to avoid fumes entirely, ASA is the modern alternative. Same thermal properties, significantly lower emissions, better UV stability.

ABS has one trick no other common filament can match.

Acetone vapor smoothing. Exposing an ABS print to acetone vapor dissolves the surface layer slightly, filling in layer lines and producing a glossy, injection-molded finish. No other common filament offers this kind of post-processing. For display pieces that need professional aesthetics, the ABS-to-acetone-smooth pipeline produces results that make people ask if the part was 3D printed at all.

Thermoplastic polyurethane bends, stretches, and bounces back. Shore hardness ratings range from 85A (firm rubber) to 95A (hard rubber), and the material absorbs impacts instead of shattering. Phone cases, drone bumper guards, shoe insoles, vibration dampeners, gripper pads — TPU occupies the category where rigid plastics fail.

Printing TPU requires a direct drive extruder. The filament is flexible enough to buckle inside a Bowden tube, jamming the pathway between the extruder gear and the hotend. Bowden setups can technically push TPU at speeds under 20mm/s, but expect frequent jams and inconsistent extrusion. Every printer we recommend for TPU — the Bambu Lab A1 Mini, Bambu Lab P2S, Prusa MK4S with Nextruder — uses direct drive.

Speed is the main compromise. TPU prints at 30-50mm/s on most machines, roughly 10x slower than PLA on a modern CoreXY. The Bambu Lab P2S's DynaSense servo extruder handles TPU better than the P1S ever did — the servo motor eliminates the grinding and clicking that plagued gear-driven extruders on flexible materials.

Layer adhesion on TPU is excellent, which makes parts nearly isotropic (equal strength in all directions). A PLA bracket has a weak Z-axis where layers delaminate under stress. A TPU part just flexes. This is why TPU dominates in applications where stress comes from unpredictable directions — like a drone landing strut that absorbs force at whatever angle the drone hits the ground.