PLA Filament Types: A Field Guide to Standard, PLA+, Silk, Matte, Tough & Filled
PLA is the easiest plastic to print and the hardest one to shop for. The spool labeled "PLA" on one store page is chemically different from the spool labeled "PLA" on the next, and the one labeled "PLA+" might be either of those with a different sticker. This guide sorts the actual pla filament types we run on our shop floor in Ogden, with the settings and tradeoffs we've measured through a lot of failed prints.
What counts as a PLA filament type (and what doesn't)
PLA is polylactic acid, a bio-sourced thermoplastic that melts around 180–220 °C. That part of the definition is stable. Everything after it isn't.
What vendors call a "type" on a product page is really a mix of three things: a chemistry tweak (impact modifiers, co-polyester blends, high-flow reformulations), a filler (wood flour, metal powder, chopped carbon fiber, chalk, phosphorescent grains), or a surface finish treatment (matte additives, silk gloss). Sometimes two or three at once. A "matte wood PLA+" is doing all three.
For this guide we cover the six buckets that actually behave differently at the nozzle:
- Standard PLA: plain polylactic acid, no modifiers worth mentioning.
- PLA+ / Tough PLA: impact-modified for better layer adhesion and drop resistance.
- Silk / matte / translucent PLA: finish-driven blends, mostly for how the part looks.
- Filled PLA: wood, metal, marble, carbon fiber, glow.
- High-speed (hyper) PLA: reformulated for 250+ mm/s on CoreXY machines.
- Specialty PLA: flame-retardant, conductive, dissolvable support variants (brief mention only).
Out of scope: PETG, ABS, ASA, TPU, nylon, PC. Those aren't PLA, and treating them like PLA is how beds get destroyed and enclosures start to matter.
Standard PLA: the honest baseline
Plain PLA is the easiest material in the hobby. It prints at 190–220 °C on a 50–60 °C bed, runs clean at 60–80 mm/s on a bedslinger, and sticks to anything from PEI to glue stick to painter's tape. Overhangs up to about 50° come out clean with part cooling cranked.
Mechanically, it's stiff and reasonably strong in tension (around 50–60 MPa tensile), but brittle. A dropped print snaps rather than deforms. The glass transition is 55–60 °C, which means a car dashboard in July will deform a PLA part, and a mug of coffee will deform a handle.
Where standard PLA wins: visual prototypes, display models, miniatures that won't be handled hard, kids' prints, cosplay props finished with paint, jigs and fixtures that live indoors at room temperature. If a part needs to look right and sit on a shelf, standard PLA is almost always the correct answer and the cheapest one.
Where it falls over: anything outdoors, anything structural, anything that lives in a car, anything a toddler will chew on seams. Our shop rule is that PLA goes to the customer only after we've asked where the part will spend its life. For an honest Utah-sun test on PLA parts outdoors, the short answer is: it survives one summer and warps.
The other thing worth knowing: PLA is hygroscopic, just slowly. A spool left open in Utah ambient humidity (around 25%) prints fine for weeks. The same spool in a humid garage picks up moisture in days and starts to pop at the nozzle.
PLA+ and 'tough' PLA: toughness without jumping materials
PLA+ is a marketing name, not a chemistry. What's inside the spool varies by vendor, but the pattern is consistent: a base of standard PLA blended with 5–15% of an impact modifier (often a thermoplastic polyurethane or a proprietary rubber-phase polymer).
The result is a filament that prints at roughly the same temperatures as standard PLA (usually 210–230 °C instead of 200–215 °C) but produces parts that bend before they snap. Our drop tests on identical geometry show about 2–3x the impact energy before fracture for PLA+ versus plain PLA. Layer adhesion is noticeably better too, which is the real win for functional parts loaded across the print axis.
Tensile strength and stiffness are roughly the same as standard PLA. Heat resistance is the same. If a part is failing because it's melting on a desk in the sun, PLA+ won't save it.
The small print-temp bump (about 10 °C hotter) matters more than people expect. Running PLA+ at standard PLA temps gives weak layer bonding and surprise splits. Running standard PLA at PLA+ temps gives stringing and sagging overhangs. The two aren't drop-in substitutes.
When to pay the ~30% premium for PLA+: enclosures that will be dropped, snap-fits that get stressed repeatedly, printer parts under vibration, anything a customer will handle daily. When to skip it and jump to PETG instead: outdoor parts, anything structural at elevated temperatures, parts that need chemical resistance. PLA+ closes some of the gap to PETG but not all of it, and PETG costs about the same.
Silk, matte, and translucent PLA: finish-driven types
Silk, matte, and translucent are the aesthetic family. All three change how the surface reads under light, and all three cost you something mechanical to get there.
Silk PLA is a PLA / co-polyester blend (often PLA mixed with a small percentage of TPEE or a modified polyester). The co-polyester shifts the surface to a high gloss that reads like injection-molded plastic, and the color saturates deeper because the pigment sits in a more transparent matrix. The tradeoff is layer bonding: silks are 20–30% weaker across the layer line than their standard-PLA siblings. For display prints, this is nothing. For a bracket, it's a dealbreaker.
Silks also want hotter nozzles. Most of ours run cleanest at 215–230 °C, and a few need 235 °C before the gloss comes in. Running silk at standard PLA temps gives you a dull, striated finish that looks worse than matte.
Matte PLA is standard PLA with a mineral additive (usually a few percent of PBAT, chalk, or a wax) that scatters light at the surface. The look is powder-coated plastic, which hides layer lines well and photographs beautifully. Our shop uses matte PLA for anything that goes on a product page or an Instagram post.
Matte prints at standard PLA temps, is slightly more brittle than plain PLA, and the additive makes it a touch more abrasive, not enough to need a hardened nozzle but enough that brass nozzles wear faster than on plain PLA. For matte PLA settings tuned for miniatures, the small-detail recipe is in that post.
Translucent PLA is pigmented but not opacified. The look depends entirely on wall count and infill. A 2-wall, 15% infill vase shows the gyroid pattern through the shell as a feature, while a 4-wall, 100% solid print reads nearly opaque. Overprinting the walls (5–6 instead of 3) is usually the fix for muddy translucents.
Filled PLA: wood, metal, marble, carbon fiber, glow
Filled PLA is standard PLA with something non-PLA stirred in. The additive drives everything about how the filament behaves.
Wood PLA carries 10–30% wood flour, which gives real wood texture that sands and stains like softwood. It wants 200–220 °C and a slightly larger nozzle (0.5 or 0.6 mm) to avoid clogs, because the particles don't melt. Mild abrasion on brass, but acceptable for occasional use.
Metal-filled PLA (copper, brass, bronze, iron) is 30–80% metal powder by weight. The spool is heavy, the parts are heavy, and you can polish or patina the surface to look like real cast metal. The downside: it chews brass nozzles fast. We've measured a 0.4 mm brass nozzle widen to 0.5+ mm after a single kilogram of bronze PLA. Hardened steel is required, not optional.
Marble and stone PLA carry chalk or ground stone particulate. Lower abrasion than metal, higher than matte. Hardened steel nozzle recommended for anything over a few hundred grams.
Carbon-fiber-filled PLA uses chopped CF (not continuous; that's a different machine entirely) at 10–20%. Prints stiffer than plain PLA and with a matte-gritty finish that reads like a composite part. Extremely abrasive. Hardened steel or ruby nozzles only. The CF doesn't make the part dramatically stronger in tension; it makes it stiffer and more dimensionally stable. People expecting PA-CF strength from PLA-CF are disappointed.
Glow-in-the-dark PLA carries strontium aluminate crystals, which are harder than most of the above combined. One of the most abrasive filaments on the market. Hardened steel non-negotiable. The glow fades over 10–30 minutes depending on charge; brighter under UV, dimmer under incandescent.
If you're running filled PLA regularly, assume hardened steel on everything and keep a brass nozzle around for standard materials. Mixing them wears the brass nozzle through the filled material and ruins the hardened one's finish on soft stuff; some printers get a nozzle per material.
High-speed and 'hyper' PLA: the newest sub-type
High-speed PLA is a reformulated PLA tuned for the flow rates CoreXY printers now hit. The melt is more fluid at a given temperature, the crystallization is faster, and the extrusion pressure needed per volume of plastic is lower. Vendor spec sheets publish flow-rate curves measured at 230 °C to prove the gain.
On a modern enclosed CoreXY running 300 mm/s with a 0.4 mm nozzle, high-speed PLA holds its surface quality where standard PLA starts to under-extrude and lose sheen. The parts are mechanically similar to standard PLA (maybe a hair weaker in layer adhesion because the crystallization is faster) but visibly cleaner at speed.
On a bedslinger, high-speed PLA is almost always wasted money. The frame flex limits useful speeds to 150–200 mm/s regardless of what the filament can do, and at those speeds standard PLA looks identical and costs 30% less.
The exception is anyone running a modern bedslinger at the top of its envelope with input shaping tuned and part cooling maxed. In that corner, high-speed PLA buys back a bit of surface quality the acceleration profile is costing. Everywhere else, standard is the smarter buy. For a broader best PLA filament for beginners pick list, the beginner guide covers which specific spools we keep on the shelf.
Quick-reference: PLA filament types by print temp and strength
| Type | Nozzle (°C) | Bed (°C) | Tensile rank | Impact rank | Nozzle wear | Use for |
|---|---|---|---|---|---|---|
| Standard PLA | 190–220 | 50–60 | Baseline | Low | None | Prototypes, display, cheap wins |
| PLA+ / Tough | 210–230 | 50–60 | Baseline | 2–3x | None | Functional, snap-fits, drops |
| Silk | 215–235 | 50–60 | Below baseline | Low | None | Display, bold color saturation |
| Matte | 200–220 | 50–60 | Baseline | Low–med | Slight (brass OK) | Hero prints, photography |
| Translucent | 200–220 | 50–60 | Baseline | Low | None | Lamps, light pipes, vases |
| Wood-filled | 200–220 | 50–60 | Below baseline | Low | Mild | Decorative, stained parts |
| Metal-filled | 190–220 | 50–60 | Below baseline | Low | High (steel) | Props, patina parts |
| CF-filled | 210–230 | 50–60 | Stiffer, not stronger | Low | Very high (steel/ruby) | Rigid jigs, visible composite look |
| Glow | 200–220 | 50–60 | Below baseline | Low | Severe (steel) | Novelty, signage, dark displays |
| High-speed | 210–230 | 55–60 | Baseline | Low–med | None | CoreXY at 250+ mm/s only |
For the full PLA filament colors and finishes library with hex codes, the swatch guide covers each finish type visually.
How to pick: a 30-second decision tree
Answer four questions in order and stop at the first "yes."
- Does the part need to survive drops, repeated stress, or outdoor-ish conditions? If yes and the environment is indoor, use PLA+. If it's outdoor, stop using PLA and go to PETG or ASA.
- Does the part need a specific finish for a customer, a photo, or a product page? Silk for glossy injection-molded look. Matte for powder-coat and hidden layer lines. Translucent for light-passing parts, tuned to 5–6 walls.
- Does the part need to look like wood, metal, stone, or glow? Filled PLA, matched to the look, with a hardened steel nozzle in the machine before you load the spool.
- Does the printer actually run above 250 mm/s with a tuned flow rate? High-speed PLA. Otherwise standard.
If none of those triggered, use standard PLA. It's the correct answer more often than the shelf of specialty spools suggests.
FAQ
Is PLA+ actually stronger than regular PLA? Yes, modestly. PLA+ formulas add impact modifiers that improve layer adhesion and impact strength, but tensile stiffness and heat resistance are similar to standard PLA.
Do I need a hardened nozzle for silk or matte PLA? Silk and matte are not meaningfully abrasive, so a standard brass nozzle is fine. Hardened steel is only required for filled PLAs with carbon fiber, metal, wood, or glow particles.
What print temperature should I use for silk PLA? Most silk PLAs want 215–230 °C, about 10 °C hotter than standard PLA, to get the glossy finish and clean layer bonding the co-polyester blend is designed for.
Can any PLA type be used outdoors? No PLA holds up long outdoors. It softens around 55–60 °C and degrades under UV. For outdoor parts, use PETG or ASA instead.
Is high-speed PLA worth it on a budget bedslinger? Usually not. High-speed PLA shines on CoreXY printers running 250+ mm/s. On a standard bedslinger, plain PLA at normal speeds gives the same visual result for less money.
For the raw technical datasheet behind most of these numbers, NatureWorks Ingeo PLA technical data is where most vendors start before they add their own modifiers.