Key takeaways
- The three differ only in additives and fillers. The base polymer is the same, so the heat ceiling is nearly the same.
- PLA-CF is not stronger than plain PLA: Polymaker publishes 31.2 MPa against 52.3 MPa, and the tensile modulus is slightly lower too. What it buys is surface and dimensional stability.
- PLA High Speed is only fast if the hot end and cooling keep up. On an ordinary printer it is simply a good PLA.
- No PLA suits parts in a car or outdoors.
PLA is the family with the most variants and also the most misunderstood, because all three grades below are called PLA and print on similar settings. The difference lies in the rest of the recipe: mineral, flow modifiers, or carbon fibre.
Three recipes, three goals
Each is optimised for one thing
- PLA Matte
- Surface — the mineral scatters light so layer lines vanish, no primer needed
- PLA High Speed
- Time — reformulated so the melt keeps up past 300 mm/s
- PLA-CF
- Dimensional stability — chopped carbon fibre lowers shrinkage and gives an even matte finish
| Panchroma Matte | PolySonic PLA | PLA-CF | |
|---|---|---|---|
| Tensile strength | 23.2 MPa | 46.0 MPa | 31.2 MPa |
| Tensile modulus | not published | not published | 3,281 MPa |
| Elongation at break | not published | not published | 13.2 % |
| HDT 0.45 MPa | not published | 53 °C | 54 °C |
| Vicat softening | 62 °C | 61 °C | 64 °C |
| Notched impact | 10.0 kJ/m² | 5.0 kJ/m² | 5.5 kJ/m² |
| Hardened nozzle | Recommended | Not needed | Required |
PLA Matte — when the print is the presentation
The mineral filler makes the surface scatter light instead of reflecting it, so the eye no longer picks up the layer lines. The part reads as one solid object. For design reviews, display housings and product-photo props, that saves a whole round of priming and sanding.
The price: the mineral is mildly abrasive. A brass nozzle will last months, not years. That is much less wear than carbon fibre, but it isn't zero.
PLA High Speed — only fast if the printer keeps up
This grade is reformulated to flow faster at the same temperature, so the hot end can supply enough material at high speed without under-extruding. But flow is only half the problem; the other half is cooling. Printing fast means each layer has less time to cool, so below 100 % fan, overhangs droop and edges round off.
PLA-CF — an upgrade in flatness and finish, not strength
Here the published numbers don't support the familiar story. Polymaker measures PLA-CF's tensile modulus at 3,281 MPa, against 3,427 MPa for unfilled PolyLite PLA — fibre at this loading does not make the part stiffer in tension, and tensile strength drops from 52.3 to 31.2 MPa. What carbon fibre really buys you is lower shrinkage, flatter parts and an even matte surface. If you need a real jump in modulus, look for a grade that states a high fibre loading — like PA6-CF20 at over 8,600 MPa. The fibre also brings shrinkage down to 0.2 %, so large parts come out flatter.
And on Polymaker's figures, PLA-CF isn't even more brittle than plain PLA: 13.2 % elongation against PolyLite PLA's 6.3 %, and notched impact of 5.5 against 3.3 kJ/m². The cost is tensile strength — about 40 % of it. If your part gets dropped or bent, it's a downgrade. The full background on filled materials is in carbon fibre vs glass fibre filament.
All three soften around 60 °C. There is no such thing as a heat-resistant PLA.
When to leave PLA altogether
- Parts in a car — a closed car in tropical sun easily exceeds 60 °C. See filament for car parts.
- Outdoor parts — PLA turns brittle and chalky after a few months of sun. ASA is the answer.
- Parts that get dropped or knocked — PETG or PA12, not PLA-CF.
- Parts in long-term contact with water — PLA slowly hydrolyses in warm water; PETG doesn't.
If you're choosing between material families rather than between three PLAs, start with PLA vs PETG vs ABS. Full settings for each grade are on the data sheet.
Frequently asked
Is PLA Matte weaker than regular PLA?
Yes, more than people expect. Polymaker publishes 23.2 MPa tensile strength for Panchroma Matte against 52.3 MPa for PolyLite PLA — the mineral that mattes the surface takes away more than half the tensile strength, while notched impact rises to 10.0 kJ/m². What it really trades is surface against nozzle life.
Can PLA High Speed be printed on an older printer?
Yes, and it prints well, but you won't see the speed. The limit is then the hot end's flow rate, not the material. On an ordinary printer it is still a good PLA — just not a faster one.
Does PLA-CF resist heat better?
No. Polymaker publishes an HDT of 54 °C for PLA-CF, which is lower than unfilled PolyLite PLA's 60 °C. Fibre doesn't change the base polymer, and the base polymer sets the heat ceiling. If you need heat resistance, move to PETG, ABS or nylon rather than a fibre-filled PLA.
Does PLA-CF need a hardened nozzle?
Yes, 0.4 mm or larger. Carbon fibre wears a brass nozzle wide within a few hundred grams, and the first symptom isn't outright failure but a surface that slowly worsens and lines that slowly widen — easily blamed on the printer.
Which PLA is cheapest for high-volume printing?
PLA High Speed, at about 0.9× PLA Matte per kilogram, and it also cuts machine hours if the hot end has the flow. For classrooms and busy workshops, the saving in machine hours is usually bigger than the saving on the spool.