11 Materials, One Honest Guide: PLA to PPS-CF

Every filament manufacturer's spec sheet reads the same way: strong, durable, easy to print, great for functional parts. That's not useful when you're staring at a part that needs to survive a Charlotte summer on a porch railing, or snap-fit a thousand times without cracking, or just come off the printer without you babysitting a dryer for six hours first.

This is the honest version — eleven materials I actually keep on hand or have printed enough to trust, what each one is genuinely good at, and just as important, what it isn't. No material here wins every category, including the one I recommend most often.

At a Glance

PLA and PETG: Where Most People Should Start

PLA is still the right call for prototypes, decorative pieces, and anything that lives indoors and doesn't take real load. It prints easy and looks great, but it softens well below the inside of a hot car and it's genuinely poor in direct sun — plan for months, not years, on an outdoor PLA part.

"PLA" isn't one material either — here's the breakdown, same honesty rule as everywhere else on this page. PETG and PCTG are shaded in below too, for a direct side-by-side rather than making you scroll back up:

Shaded rows are PETG and PCTG — not PLA variants, just placed here for comparison. Details on both below.

PETG is the step up most people reach for, and for good reason — tougher than PLA, easier to print than ABS. The part people miss: PETG is more moisture-sensitive than its reputation suggests. It won't crackle and pop like Nylon, but a spool left open on a humid week will quietly print worse — more stringing, softer layer bonds — without an obvious warning sign.

If you're already looking at PETG, it's worth knowing what I'd actually recommend instead: PCTG. At a comparable cost, PCTG is tougher, absorbs less moisture (~0.15%, actually lower than PLA), and holds up better to real handling and impact — with almost none of PETG's stringing tendencies. For most everyday parts I'd steer you to PCTG over PETG by default — it's not a specialty upgrade, it does the same job better for close to the same money. If you're choosing on looks alone, standard PLA still wins — but that's the trade you're making.

TPU and PEBA

Flexible materials get judged on a different scale entirely — Shore hardness (how soft or firm) and elongation or rebound (how far it stretches, and how much energy it gives back), not tensile strength or UV resistance.

TPU is the flexible material most people should start with — it prints more predictably than PEBA and covers the vast majority of flexible-part needs, from phone cases to gaskets to vibration dampeners.

PEBA is the specialist: when a part needs to compress and spring back thousands of times without going dead — think midsoles, suspension bushings, anything cyclical — its energy return is meaningfully better than TPU's, and it holds up better in cold. It's pricier and less common, which is exactly why most people default to TPU without knowing PEBA exists.

ASA, ASA-CF, PCTG-CF/GF, PC, and PC-ABS

This is the group people ask about most, because it's where "which material" actually changes whether the part survives its job.

If a part is going to sit outside — a mailbox bracket, a porch fixture, anything that sees direct sun for months — ASA or ASA-CF is the honest answer, not PCTG in any form. ASA's chemistry was built for UV stability the way PCTG's wasn't, and no amount of brand loyalty to a favorite material changes that. ASA-CF adds stiffness on top of that UV resistance for parts that also need to hold structural load outdoors, at the cost of being harder on nozzles and pricier.

When a plain-PCTG part needs more stiffness than it can deliver — a bracket under real load, a fixture that can't flex — PCTG-CF and PCTG-GF step in. CF is stiffer and lighter but abrasive on brass nozzles and gives up some surface finish; GF gets most of the stiffness gain with an easier print and less hardware wear. Neither changes the UV story — for outdoor structural parts, ASA-CF still wins.

PC and PC-ABS earn their place when a part needs to survive real heat — near a heat source, inside a hot enclosure, somewhere PLA or PETG would visibly sag. Pure PC has the higher ceiling; PC-ABS trades a little of that strength for a print that fights you less.

Where PCTG Actually Fits

PCTG isn't the strongest material on this list, and it isn't the most UV-resistant one — ASA and ASA-CF both beat it outdoors, and PC beats it on raw heat resistance. What plain PCTG wins is the everyday case: it prints almost as easily as PETG, tolerates humidity better than PLA (about 0.15% moisture absorption — lower than PLA itself), and holds up to real handling without the brittleness PLA eventually shows. For a functional part that isn't going outside and isn't going near real heat, it's the material I reach for by default — not because it's the best at any one number, but because it doesn't make you think hard about drying, warping, or bed adhesion to get a good result. Need more stiffness than plain PCTG offers? PCTG-CF and PCTG-GF carry the same easy-print, moisture-tolerant character up into engineering territory. When a part needs a true specialist — UV, heat, chemical exposure — I'll say so and point you at the material that's actually built for it.

Not All Nylon Is the Same Material

"Nylon" gets treated like one filament when it's really a family, and which variant you get changes the part's strength, stiffness, and how badly it'll punish you for leaving it unsealed. Here's the honest breakdown — including the variants I don't currently stock, so you know exactly what you're choosing between rather than a vague "Nylon options" line.

*I don't currently offer this material — if your part calls for it specifically, ask and I'll look into adding it.

Standard PA, PA6-CF, PA6-GF, and PA12-CF are all part of my regular material lineup. Across the whole family, moisture is the thing to respect — even the best-behaved variant here absorbs more than PLA or PCTG, and the unfilled/PA6 variants can go from printable to compromised in under six hours of open-air exposure in a humid room. If a part needs Nylon's toughness or fatigue resistance, budget for active drying as part of the job, not an afterthought.

PPS-CF: The Industrial Specialist

PPS-CF is in a different league from everything else on this list — continuous-use temperatures around 220°C, a heat deflection temperature near 260°C, UL94 V0 flame resistance, and strength that starts to approach metal in the right geometry. It's also the least forgiving material to print: it needs hardware most desktop printers simply don't have — an all-metal hotend rated well past what ASA or Nylon requires, and usually a heated chamber. This is the material for industrial, high-heat, or chemical-exposure applications, not a casual print.

Heat Deflection, Melting, and Real Continuous-Use Temps

Everything above should be enough to pick a material. This table is here for the part of you that wants the underlying numbers — heat deflection temperature (HDT, the point a material starts to bend under load), melting or softening range, and a realistic continuous-use ceiling for a part sitting under sustained heat, not a five-minute spike. Skip it if the categories above already answered your question.

*Not currently offered — ask if your part needs it. Figures above are compiled from manufacturer datasheets and general engineering references; exact numbers vary by brand, fiber loading, and test method (ISO 75 / ASTM D648). HDT is a standardized deflection-under-load test — it is not the same as a safe continuous-use temperature, which is typically lower. Treat these as comparison points between materials, not a guarantee for your specific part and load case.

TPU and PEBA aren't in this table because HDT isn't a standard test for elastomers — they're rated by how much of their flexibility they keep across a temperature range, not by bending under load. Both process in a 210–245°C / 410–473°F melt range; PEBA holds its flexibility well below freezing better than TPU does, which is its real cold-weather advantage.

There's No Single Winner — That's the Point

If you take one thing from this: the right material question isn't "what's the best filament," it's "what does this specific part actually need to survive." Everyday functional parts that just need to work without a fight — that's where PCTG earns its spot as the default. Flexible with spring-back, PEBA over TPU. Outdoors and UV, ASA or ASA-CF. Real heat, PC or PC-ABS. High-fatigue mechanical load, the right Nylon variant. Industrial heat and chemical exposure, PPS-CF.

Not sure which of these your part actually needs? That's exactly the kind of question worth asking before you order, not after a part fails outside in July.