PLA/CF vs plain PLA — parameter comparison and when to choose which

The decision in one sentence: you buy PLA/CF for stiffness and a matte, technical finish, and you pay for it with a hardened nozzle, the loss of fine detail and a drop in impact resistance — if you cannot give up any one of those three, stay with plain PLA.

The first cost of PLA/CF is not the spool but the nozzle. The manufacturer Porima's official FDM table carries the entry "very high" in the abrasiveness field — besides PLA/CF, the only material in the whole catalogue with that value is ABS/CF. A brass nozzle wears out fast enough with this material that by the time you notice the problem, the dimensions have already drifted. The second thing few people mention before you buy: carbon fibre raises stiffness, but in the manufacturer's table it lowers impact resistance from "high" to "medium". This is not a stronger version — it is a version with a different character.

Comparison table

Parameter	PLA/CF	PLA
Nozzle temperature	220–250 °C	200–230 °C
Bed temperature	50–70 °C	0–60 °C
Cooling	60–100%	100%
Drying	4 h / 55 °C	2–4 h / 30–40 °C
Chamber enclosure	open frame	open frame
Temperature resistance	70 °C	60 °C
Print difficulty	medium	very easy
Warping	low	none
Stringing	low	low
Layer cohesion	good	good
Impact resistance	medium	high
Flexibility	very low, i.e. the highest stiffness	low
Surface finishing	easy	easy
Support removal	easy	easy
Colour saturation	low	high
Finish	matte	smooth
Odour	low	none
Nozzle abrasiveness	very high, hardened nozzle required	none
Detail printing	from 0.4 mm	from 0.2 mm
Print speed	high	high
Bambu AMS	compatible	compatible

A highlighted cell marks the material that is clearly better in that row. We do not score the flexibility row, because a lower value is the goal here, not a shortcoming. Source: the official FDM technical data table from the manufacturer, Porima. Full data sets: PLA/CF print parameters · PLA print parameters.

When to choose PLA/CF

Brackets and frames with a long reach that must not sag. Flexibility "very low" is an advantage here: the part holds its geometry under its own weight and under a static load.

Structural parts of model aircraft and RC vehicles. Stiffness at low mass is exactly the trade-off carbon fibre is added for.

Workshop jigs, drilling templates, guides. Things that must not deform in use and that do not care about a nice colour.

Housings and panels with a technical, matte look. The matte surface of PLA/CF hides layer lines far more effectively than glossy plastics do, and needs no finishing at all.

Parts that will stand in room-temperature warmth with a small margin. A declared 70 °C instead of 60 °C, under the same printing regime on an open frame.

When to choose PLA

Anything with fine detail. The row "detail printing from 0.4 mm" for PLA/CF against "from 0.2 mm" for PLA is a hard limit. Figurines, lettering, fine-pitch threads and thin ribs are out.

Prints in a strong colour. Colour saturation "low" against "high". Carbon fibre always pulls the colour towards grey and black.

Parts that may take a knock or be dropped. Impact resistance falls from "high" to "medium" — the only row where PLA/CF comes off worse than the material it is made from.

Printers with a standard brass nozzle. If you do not have a hardened nozzle and are not planning to buy one, the subject is closed at that row.

Toys, gifts, prints for children. Odour "none" against "low", and the full colour range. There is no argument here for the fibre-filled version.

What the table won't tell you

Stiffness and strength are not the same thing, and the table shows that trade-off plainly. Flexibility falls from "low" to "very low", and impact resistance from "high" to "medium". In other words: a PLA/CF part gives less, but once you cross the limit it will break sooner and without warning. For a bracket that has to hold a dimension — excellent. For a handle that will fall off a shelf — worse than plain PLA.

The "hardened nozzle required" entry does not apply to just one spool. Brass wears with this material quickly and insidiously: the nozzle diameter slowly grows, and what you see first is small dimensional inaccuracies, then over-extrusion, while you go looking for the cause in the slicer. A steel or carbide nozzle is a condition of entry, not an upgrade.

70 °C is the manufacturer's label, not HDT. There is no standard or described test method behind it. Ten degrees over plain PLA does not make PLA/CF a heat-resistant material — a part in a car parked in summer is still out. If your problem is temperature, the right direction is PETG or ASA, not carbon fibre.

Drying for 4 h at 55 °C is a different profile from the rest of the PLA family. Plain PLA is dried for 2–4 h at 30–40 °C. If you use one dryer setting for all your PLA spools, with PLA/CF you will only half-dry the material.

The larger nozzle diameter changes the design, not just the profile. Since detail only starts at 0.4 mm, thin walls and small features have to be thickened in the CAD model. The slicer will not fix that for you, and trying to print a model prepared for 0.2 mm will end in holes in the walls.

Where to check this further

• Filament comparison — which material to choose for what — the hub for all ten pair comparisons plus the main table of twelve material families.
• PLA/CF print parameters — the complete set of fields from the manufacturer's table, with the nozzle warning.
• PLA print parameters — the reference point for the whole family.
• Blocked nozzle — fibre-filled materials block differently from plain ones.
• Under-extrusion — the first symptom of a worn or too-narrow nozzle.
• Gaps in thin walls — typical with models designed for 0.2 mm.
• Dimensional accuracy — a growing nozzle diameter shows up here first.

Materials to buy: Porima PLA/CF filament 1 kg and Porima PLA filament 1 kg.