Nylon-CF vs Nylon-GF vs PLA-CF vs PLA-GF: Choosing a Fibre-Filled Material
We print four fibre-reinforced materials, and they are not four grades of the same thing. Two are built on PLA and two on nylon, and that base decides far more about how your part behaves than whether the fibre is carbon or glass. This page lays them side by side, with prices, so you can pick in a minute.
The four, and what they cost
PLA-CF (Bambu PLA-CF): ₹9 per gram plus GST. Very stiff for the price (about 3,950 MPa flexural modulus on Bambu's datasheet), light, matte black and easy to print accurately. Softens at about 55 °C.
PLA-GF (glass fibre PLA): ₹12 per gram plus GST. Rigid with excellent dimensional stability, for jigs and fixtures that stay indoors.
Nylon-GF (Bambu PA6-GF): ₹24 per gram plus GST. Tough nylon with glass fibre, the most heat-resistant of the four at 182 °C heat deflection.
Nylon-CF (eSUN ePA-CF): ₹25 per gram plus GST. The stiffest of the four by a wide margin, tough, and good to around 155 °C.
Choose the base plastic first
The first question is temperature and abuse. If the part lives indoors, never sees more than warm room conditions and does not get knocked about, a PLA base is enough and costs roughly a third as much. If it sits in a car, near a motor, outdoors in Indian summer heat, or takes vibration and impact, it needs a nylon base. PLA-based parts can creep and sag in a parked car long before they visibly fail.
Toughness follows the same split. PLA composites are stiff but brittle; they hold shape until they crack. Nylon composites are stiff and still tough enough to survive a drop or a bolt being overtightened.
Then choose carbon or glass
Within nylon, the fibre is a real trade. Nylon-CF is the stiffer one: about 6,450 MPa flexural modulus on eSUN's datasheet against about 3,670 MPa for Bambu PA6-GF, so under the same load a Nylon-CF bracket bends noticeably less. Nylon-GF wins on heat, rated to 182 °C against 155 °C. Our prices for the two are almost the same, so choose on stiffness versus heat rather than cost.
One honest caveat: those figures come from two different manufacturers' datasheets, and each tests in its own way. Use them to rank the materials, not as exact design values.
Within PLA, carbon fibre is the cheaper option here and gives the familiar carbon look; glass fibre is the better pick for flat parts and fixtures where holding a dimension matters more than appearance.
Quick picks
Indoor bracket, enclosure part or display piece that should look carbon: PLA-CF. Assembly jig or drilling template used on a bench: PLA-GF. Part near an engine, heater or motor, or one that must survive heat above 150 °C: Nylon-GF. Drone, robot or machine part where every gram and every bit of flex counts: Nylon-CF.
And if your part needs to bend rather than stay rigid, none of these four is right. Plain Nylon PA12 or TPU will serve far better, since fibre always trades flexibility for stiffness.
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Frequently asked questions
Which fibre-filled material is strongest?+
For stiffness, Nylon-CF, by a wide margin. For heat resistance, Nylon-GF. For toughness, either nylon composite is far ahead of the PLA ones. There is no single strongest; it depends on whether your part must not bend, must not soften, or must not crack.
Is PLA-CF a cheaper substitute for Nylon-CF?+
Only for indoor parts at room temperature. PLA-CF looks similar and is stiff, but it softens at about 55 °C and is much more brittle. In a car, near electronics or outdoors it can deform where Nylon-CF would not.
Why do the nylon composites cost so much more?+
The filament itself costs several times more, it has to be dried for twelve hours or more before printing, and it prints hotter and slower in an enclosed chamber. The price reflects both the material and the process.
Can I mix materials in one order?+
Yes. Each part in an order can use its own material, so a jig base in PLA-GF and its clamping arms in Nylon-CF is a perfectly normal order.
Ready to start?
Browse the shop or tell us your idea, we'll make it to order and ship it across India.