ASA vs Nylon vs TPU vs PC: Engineering Filament Guide

Once you've printed a few hundred hours of PLA and PETG, you start running into walls those materials can't get over. A part that cracks under vibration. A bracket that yellows after a summer outdoors. A gasket that needs to squish.

That's where engineering filaments come in. They're not upgrades so much as specialists — each one solves a specific problem, and each one asks something from your printer in return. Here's what each is actually for.

New to this? Start with our guide to PLA vs PETG vs ABS first.

ASA: ABS that survives the sun

ASA is chemically close to ABS — similar strength, similar heat resistance, similar printing behavior — with one decisive difference: it doesn't degrade under UV. ABS left outdoors turns chalky and yellow within a season. ASA holds its color and mechanical properties for years.

It prints much like ABS, which means it warps and needs an enclosure. Expect a nozzle around 240–260°C and a bed near 100°C. Ventilation matters here too.

Best for: outdoor mounts, garden and irrigation parts, automotive exterior pieces, signage, drone frames.

Choose ASA over ABS whenever the part sees daylight. There's very little reason to pick ABS for an outdoor application. If you want a glossy, finished look on an ASA part, see our ASA vapor smoothing guide.

Nylon (PA): tough, slippery, and thirsty

Nylon is the toughest common filament — not the stiffest, but the one that bends, absorbs abuse, and refuses to snap. It's also naturally low-friction, which makes it the default for moving parts: gears, bushings, hinges, cable guides.

The problem is water. Nylon absorbs moisture from the air faster than anything else on this list, and a wet spool prints as a bubbling, popping, structurally worthless mess. Drying isn't optional maintenance — it's part of the workflow. Dry at 70°C for 6–12 hours and print straight from a dry box. See our filament drying guide for the full process.

It also needs heat: 250–270°C nozzle, 70–90°C bed, and a hardened nozzle if you're running a glass- or carbon-filled blend. Adhesion is finicky; a garolite or PEI sheet helps considerably — our first layer adhesion guide covers surface matching in more depth.

Best for: gears, living hinges, tool parts, RC components, anything that flexes repeatedly without failing.

TPU: the flexible one

TPU is rubber-like — you can bend, compress, and stretch a printed part and it returns to shape. Hardness is measured in Shore A: 95A is firm and relatively easy to print, while 85A and softer gets genuinely floppy and demanding.

The main constraint is your extruder. Bowden setups struggle because flexible filament buckles in the tube; direct-drive extruders handle it far better. Either way, slow down hard — 15–25mm/s — and disable or drastically reduce retraction.

Best for: phone cases, gaskets, seals, tires, vibration dampers, grips.

Polycarbonate (PC): maximum strength

PC is the strongest and most heat-resistant filament most hobbyists will ever run — it holds structure past 110°C and takes serious impact before failing. Printed correctly, it can be nearly transparent.

It's also the most demanding. Nozzle temperatures of 270–310°C exceed what many stock hotends can reach, and PC warps aggressively enough that an enclosure with a genuinely warm chamber is required. Like nylon, it drinks moisture and needs drying.

Best for: structural brackets, machine parts, light housings, anything near heat or under load.

Carbon-fiber and glass-filled blends

These aren't separate materials — they're additives mixed into a base like PETG, nylon, or PC. The fibers add stiffness and dramatically reduce warping, which makes a CF blend often easier to print than its plain version. The finish is a matte, slightly textured black that hides layer lines well.

Two costs: filled filaments are more brittle in thin sections, and they will grind a brass nozzle down within a few spools. A hardened steel or ruby nozzle is mandatory.

Best for: drone frames, jigs and fixtures, camera mounts, dimensionally critical parts.

What your printer needs to run them

Print settings are the easy part. What actually gates these materials is hardware — an enclosure to hold chamber heat, a dry box to keep moisture out, and in a couple of cases a nozzle or hotend upgrade.

How they compare on heat

Heat resistance is the property most often driving the jump away from PETG, and it's where these materials separate most clearly.

For the complete picture across all 21 filaments we carry, see our full material guide.

Comparison at a glance

What to buy next

If you're stepping past PETG for the first time, the honest order of usefulness for most people is:

1. TPU — solves problems no rigid filament can, and works on most printers as-is.
2. ASA — if you print anything that lives outside.
3. CF-PETG or CF-nylon — for parts that need to hold their shape precisely.
4. Nylon or PC — once you have an enclosure and a filament dryer, not before.

The pattern worth noticing: the harder a filament is to print, the more of the difficulty comes from moisture and temperature stability rather than settings. A dryer and an enclosure unlock more materials than any slicer tweak will.

Shop engineering filaments at readytoprint3d.com — or get in touch and tell us what you're building.

Frequently asked questions

Is ASA better than ABS?
For outdoor parts, yes — ASA resists UV degradation while ABS yellows and becomes brittle. Indoors, they perform similarly.

Why does nylon need to be dried?
Nylon absorbs airborne moisture quickly, and that water turns to steam at printing temperature, causing bubbling, poor layer bonding, and weak parts.

Can any printer use TPU?
Most can, but direct-drive extruders handle it far more reliably than Bowden setups, especially with softer grades below 95A.

Does carbon-fiber filament damage printers?
It wears out brass nozzles quickly. A hardened steel nozzle is required for any filled filament.