Rapid prototyping · Updated 2026-10-14
PLA vs PETG vs ABS vs TPU: Which 3D Printing Filament to Use?
How PLA, PETG, ABS, ASA, TPU and nylon compare on strength, heat and printability, and which ones survive a Pakistani summer.
Short answer: use PLA for indoor models and fit checks, PETG for most functional parts, ABS or ASA for parts that get hot or sit in the sun, TPU for anything that must bend, and nylon for gears and wear parts. In Pakistan, heat is the deciding factor more often than strength: a PLA part left in a parked car in Multan in June will soften and bend.
Filament comparison table
Values are typical datasheet ranges. Brands and grades differ, so check the datasheet for the exact filament used.
| Filament | Tensile strength | Softens at about | Toughness | Outdoor / UV | Ease of printing | Relative cost |
|---|---|---|---|---|---|---|
| PLA / PLA+ | 50 to 60 MPa | 55 °C | Low (brittle) | Poor in heat | Easiest | Low |
| PETG | 45 to 55 MPa | 70 to 75 °C | Good | Good | Easy | Low |
| ABS | 35 to 45 MPa | 95 to 100 °C | Very good | Poor (yellows in sun) | Hard (needs enclosure) | Low to medium |
| ASA | 40 to 50 MPa | About 95 °C | Very good | Excellent | Hard (needs enclosure) | Medium |
| TPU 95A | 25 to 35 MPa | About 60 °C under load | Excellent (flexible) | Good | Moderate (print slowly) | Medium |
| Nylon (PA) | 40 to 70 MPa | 80 °C and up, by grade | Excellent | Good | Hard (must be kept dry) | High |
| Carbon-fibre nylon | Very stiff | 100 to 150 °C, by grade | Good | Good | Hard (hardened nozzle) | Highest |
Which filament survives a Pakistani summer?
Summer air temperatures in Multan, Jacobabad, Sibi and much of Punjab and Sindh regularly pass 45 °C. A car parked in the sun, a rooftop box or a panel next to a motor can get much hotter.
- Indoors, air-conditioned: any filament works.
- Indoors, no air-conditioning, near electronics: PETG or better.
- Outdoors in shade: PETG or ASA.
- Outdoors in direct sun, or inside a parked car: ASA, ABS or nylon. Do not use PLA or standard resin.
- Next to hot motors, regulators or engines: ASA, ABS or carbon-fibre nylon, after checking the actual temperature.
PLA: easy to print, but not for heat
PLA prints accurately with little warping, so it is the default for concept models, architectural models and first fit checks. It is stiff but brittle, and it starts to soften at about 55 °C. Use it only for parts that stay indoors and do not take impacts.
PETG: the default for functional parts
PETG is tougher than PLA, bonds well between layers, resists water and many chemicals, and handles temperatures up to about 70 °C. It suits brackets, enclosures, robot chassis, pump housings and snap fits. It can string slightly, so very fine detail is harder than with PLA.
ABS and ASA: heat and impact resistance
ABS takes heat up to about 95 to 100 °C and absorbs impacts well, but it shrinks as it cools and warps unless printed in an enclosed printer. It also gives off fumes, so print it with ventilation. ASA behaves like ABS but resists sunlight, which makes it the better choice for anything outdoors, such as sensor housings, antenna mounts and car exterior parts.
TPU: flexible parts
TPU is a rubber-like filament. The common 95A grade is firm but flexible, similar to a skateboard wheel. Use it for gaskets, bumpers, vibration dampers, grippers and phone cases. It prints slowly, and softer grades need a direct-drive extruder.
Nylon and carbon-fibre nylon: gears and wear parts
Nylon is tough, slides well and resists wear, so it is the right choice for gears, bushings and hinges. It absorbs moisture from the air, so the filament must be dried before printing, and parts change slightly in size with humidity. Carbon-fibre nylon is much stiffer and handles more heat; it needs a hardened nozzle. For the highest-quality nylon parts, consider SLS or MJF printing in PA12 instead of FDM.
Quick selection guide
- Display model or first fit check: PLA
- Bracket, enclosure, jig or snap fit: PETG
- Outdoor or in-car part: ASA
- Part near heat or taking hard impacts: ABS or ASA
- Seal, bumper, damper or flexible grip: TPU
- Gear, bushing or wear surface: nylon (FDM) or PA12 (SLS/MJF)
- Small part with very fine detail: resin (see resin materials)
Design limits such as minimum wall thickness and clearances are in the wall thickness and tolerance chart.
Frequently asked questions
Is PETG better than PLA?
For functional parts, usually yes: PETG is tougher and handles more heat. PLA is easier to print and gives sharper detail, so it is better for display models and quick fit checks.
Why do PLA parts bend inside cars in Pakistan?
PLA softens at about 55 °C, and a car parked in the sun in summer gets far hotter than that inside. Use ASA, ABS or nylon for car parts.
Is PETG waterproof?
The material resists water, but printed parts can have small gaps between layers. For watertight parts, use more wall lines, a slightly higher flow rate and a test under pressure.
Which filament is strongest?
It depends on the load. PLA is stiff but brittle, PETG and ABS are tougher, and nylon and carbon-fibre nylon are the strongest common FDM options for gears and load-bearing parts.
Need help with the next step?
Need a part 3D printed?
Send your CAD file and a line about what the part must do. PakMEC prints in FDM, resin, SLS, MJF and metal, and an engineer will recommend a process and quote it.