PETG handles most functional parts well. It is easy to print, reasonably tough, and forgiving on a wide range of machines. The problem shows up when a part has to hold its shape in heat, take repeated impact, or carry a constant load without creeping. That is where PETG starts to give out, and the usual next thought is a high-temperature polymer like PEEK or ULTEM.
For most shops, that jump is overkill. PEEK and ULTEM need high-temp hotends, 150°C+ chambers, careful handling, and a materials budget that is hard to justify for jigs, fixtures, and functional prototypes. Polycarbonate filament sits in the gap between the two. It prints on a machine with a heated chamber and an all-metal hotend, which many engineers already own, costs a fraction of the ultra-polymers, and holds up to heat and mechanical stress that would soften or crack a PETG part.
This guide covers what polycarbonate filament is good for, how it stacks up against the materials on either side of it, and how to print PC and PC-CF without the warping and layer separation that gave the material its difficult reputation.
What is polycarbonate filament used for?
Polycarbonate filament is used for functional parts that need to keep working under heat and mechanical stress. It is a go-to for parts that would deform, fatigue, or fail in a lower-grade material.
Common applications include:
- Jigs, fixtures, and manufacturing tooling that sit near heat or take repeated handling
- Functional prototypes meant to behave like the production part, not just look like it
- Enclosures and housings exposed to heat, such as parts near motors, lighting, or engine bays
- Snap-fit and living-hinge components that need to flex without cracking
- Electronics tooling and housings, where ESD-safe and flame-retardant PC grades apply
In aerospace and defense and automotive work, polycarbonate 3D printing earns its place on parts that see elevated temperatures or sustained load during testing and short-run production. It gives engineers a material that performs close to an injection-molded part without the tooling cost.
Where polycarbonate filament sits on the performance and price ladder
The easiest way to understand PC is to place it among the materials engineers already know. Moving up the ladder, each step adds heat resistance and strength and takes away ease of printing.
| Material | Heat resistance | Toughness | Print difficulty | Relative cost |
| PETG | Low (softens near 70°C) | Moderate | Easy | Low |
| ABS / ASA | Medium (around 100°C) | Good | Moderate | Low |
| Polycarbonate (PC) | High (HDT roughly 110–135°C) | Very high | Demanding | Medium |
| Nylon (PA) | Medium to high | Very high, flexible | Demanding | Medium |
| PEEK / ULTEM | Very high (150°C and up) | Extreme | Specialist hardware only | Very high |
PC is the practical ceiling for most engineers printing on a quality machine with a heated chamber. It covers the performance most functional parts need, and it does it without the equipment and cost of the ultra-performance polymers above it. Nylon sits alongside PC rather than above it, with a different profile: nylon is more flexible and chemically resistant, while PC is stiffer and holds dimensional accuracy better.
Is polycarbonate stronger than PETG or ABS?
Yes. Across the measures that matter for functional parts, polycarbonate 3D printing outperforms both PETG and ABS.
- Tensile strength: PC is stronger than PETG and ABS, so parts carry more load before they yield. 3DXMAX® PC tests at 62 MPa tensile strength (ISO 527).
- Impact strength: This is where PC separates from the pack. It is the same polymer family used in safety glazing and protective shields, and one of the highest-impact common filaments, which is why it is used for parts that get dropped, clamped, or struck.
- Heat resistance: PC holds its shape under load to roughly 110–135°C depending on grade, compared with around 70°C for PETG and about 100°C for ABS. 3DXMAX PC has a heat deflection temperature of 135°C (0.45 MPa) and a glass transition temperature of 147°C. Confirm the exact figure on the product's technical data sheet for your load condition.
The trade for that performance is printability. PC asks for more heat, a heated chamber, and dry filament. Get those right and you get a part that behaves far closer to an engineering-grade component than anything PETG can produce.
Key properties of PC filament
Heat deflection
Heat deflection temperature tells you when a part starts to soften under load. PC's high figure is the main reason to choose it. A PETG fixture left in a hot car or next to a heat source can sag; a PC part in the same spot keeps its geometry. If your part sees any sustained heat, this property alone can decide the material. Note that the glass transition temperature (147°C for standard PC) is higher than the heat deflection figure; for parts under load, design to the HDT.
Impact strength
PC resists cracking under sudden force better than almost anything else you can print on a standard machine. Parts flex and absorb energy instead of shattering. That makes it a strong choice for protective housings, brackets, and anything that takes repeated mechanical shock.
Dimensional stability
PC is amorphous, so it shrinks less and more evenly than semi-crystalline materials. Once printed and cooled, it holds its dimensions well under heat and load, which matters for fixtures and assemblies that have to stay accurate. The catch is that getting to a stable, accurate part depends on controlling shrinkage during the print itself, which is the printing challenge covered next.
Is PC filament hard to print?
PC filament is demanding, but it is predictable. The difficulty is not random. It comes from three things: moisture, temperature, and shrinkage. Control those and PC becomes a reliable material rather than a frustrating one. Here is how to handle each.
Dry the filament first
Polycarbonate absorbs moisture from the air quickly, and wet PC prints badly. You get stringing, bubbling, weak layers, and a cloudy finish. Drying is not optional with PC, and it is the single most common reason a print fails.
Dry each grade at these settings before printing:
- 3DXMAX® PC and CarbonX™ PC+CF: 120°C for at least 4 hours
- ezPC™ and CarbonX™ ezPC™+CF: 80°C for at least 4 hours
- Heavily saturated spools of any grade: longer than the 4-hour minimum
The 120°C setting needs a dryer built for engineering polymers, such as the FD1 Filament Dryer, which runs up to 150°C. After drying, store the spool sealed with fresh desiccant, ideally below 15% relative humidity, or in the FM1 Filament Maintainer. Keep it dry while printing so it does not reabsorb moisture mid-job. Our guide to drying 3D printer filament covers temperatures and times for every material, and the full table is on our filament drying instructions page.
What temperature do you print polycarbonate at?
Polycarbonate prints hot, and the right settings depend on the grade. Use these nozzle and bed temperatures as starting points:
- 3DXMAX® PC and CarbonX™ PC+CF: 280–310°C nozzle, 110–120°C bed, 65°C chamber temp minimum, ideally 90-100°C chamber temp
- ezPC™: 255–275°C nozzle, 90–110°C bed, 40-60°C chamber temp
- CarbonX™ ezPC™+CF: 260–280°C nozzle, 80–100°C bed, 40-60°C chamber temp
Standard PC needs a hotend that reaches 300°C or more. An all-metal hotend is the safe choice, since PTFE-lined hotends are not built for sustained temperatures in this range. ezPC's lower range is why it is a good starting point for a first PC project.
A heated, enclosed chamber is recommended for every grade. Start from the filament's technical data sheet or our print profiles and tune from there, because the right numbers shift with the grade and the machine.
Use a heated enclosure
PC needs a warm, stable environment around the print, preferably 65°C or hotter. A heated enclosure keeps the chamber temperature up and blocks drafts, which is what prevents the lower layers from cooling and pulling away from the upper layers. Open-frame printing with PC will likely end in warping or a part that splits along a layer line partway up. For most PC work, a heated enclosure is a requirement, not a nice-to-have. If your printer can’t hold a chamber temperature of 65°C or higher, ezPC is a good alternative because it prints reliably at a lower chamber temperature.
Controlling warping
Warping comes from uneven cooling and shrinkage. Beyond the heated enclosure, a few habits keep parts flat and bonded:
- Run a hot bed with a PC-compatible bed adhesive such as Magigoo, and consider a brim or raft on larger footprints
- Preheat the bed and let the chamber come up to temperature before the first layer goes down
- Keep part cooling fans low or off, since aggressive cooling is what triggers layer separation in PC
- Round sharp corners in the design where you can, because corners concentrate stress
- Keep the chamber warm and draft-free from the first layer to the last
PC filament vs PC-CF filament: when reinforcement is worth it
PC-CF filament is polycarbonate reinforced with chopped carbon fiber. The fiber changes the material's behavior in ways that matter for specific jobs, and it is not simply a stronger version of PC across the board.
When to choose PC-CF filament
Choose PC-CF over standard PC when:
- Stiffness is the priority. Carbon fiber raises rigidity sharply. CarbonX™ PC+CF has a tensile modulus of 6,200 MPa, about 2.5 times the 2,410 MPa of unreinforced 3DXMAX PC, so it resists bending and holds its shape under load better.
- Dimensional stability has to be tight. The fiber further reduces shrinkage and warping, which makes large or flat parts easier to print accurately.
- Strength-to-weight matters. PC-CF gives a stiffer part at lower weight, which is why it suits brackets, structural fixtures, and load-bearing tooling.
- You want a matte surface finish that hides layer lines better than glossy neat PC.
When to stay with standard PC
Stay with standard PC when impact resistance and a degree of flex are what the part needs. Adding carbon fiber increases stiffness but reduces impact toughness and elongation: CarbonX PC+CF elongates about 2% before breaking, compared with 7% for 3DXMAX PC. A reinforced part is more rigid and more brittle. Reach for PC-CF when you need stiffness and dimensional accuracy, and keep neat PC when you need impact toughness.
Printing PC-CF
PC-CF prints at the same temperatures as its base grade (see the list above) and dries the same way. Carbon fiber is abrasive and will wear out a standard brass nozzle, so PC-CF needs a hardened steel nozzle of 0.4 mm or larger.
Matching the right polycarbonate to the job
Polycarbonate is a family, not a single material. The right grade depends on how hard the part has to print and what it has to survive in service. 3DXTECH's lineup maps onto the decisions in this guide:
- ezPC™ Polycarbonate for a first polycarbonate project or a part that does not need maximum heat performance. It prints cooler with low warp and still delivers a 112°C heat deflection temperature.
- 3DXMAX® PC, made from SABIC LEXAN™ resin, for maximum heat resistance and impact strength on demanding functional parts.
- CarbonX™ PC+CF and CarbonX™ ezPC™+CF when the part needs stiffness, dimensional accuracy, and strength-to-weight.
- Firewire® FR-PC/ABS and 3DXLABS™ FR-PC for enclosures and housings with fire-safety requirements. Firewire is a PC/ABS blend made with UL94 V-0 rated resin, and 3DXLABS FR-PC is rated UL94 V-0 at 1.5 mm.
- 3DXSTAT™ ESD-PC for electronics tooling and parts that need static dissipation, with a target surface resistance of 10⁴–10⁹ ohms.
Not sure which grade fits your application? Browse 3DXTECH's polycarbonate filament lineup to compare PC and PC-CF options side by side, and check each grade's technical data sheet for the exact heat and strength figures your part needs.
Frequently asked questions
What is polycarbonate filament used for?
It is used for functional parts that need heat resistance, impact strength, and dimensional stability: jigs, fixtures, tooling, heat-exposed housings, snap-fit parts, and functional prototypes. It is common in aerospace, automotive, defense, and electronics work.
Is polycarbonate stronger than PETG or ABS?
Yes. PC has higher tensile strength, much higher impact strength, and far better heat resistance than both PETG and ABS. 3DXMAX PC, for example, has a 62 MPa tensile strength and a 135°C heat deflection temperature. The trade is that PC is harder to print and needs dry filament, higher temperatures, and a heated enclosure.
Is PC filament hard to print?
It is demanding but predictable. The three things to control are moisture, temperature, and warping. Dry the filament at 120°C for 4+ hours (80°C for ezPC), print hot in a heated enclosure with an all-metal hotend, and manage cooling, and PC prints reliably. Easier-printing PC grades like ezPC lower the barrier for a first attempt.
What temperature do you print polycarbonate at?
Standard PC prints at 280–310°C at the nozzle with a bed at 110–120°C. Easier-printing ezPC runs cooler, at 255–275°C with a 90–110°C bed. A heated enclosure is recommended for every grade, at 65°C or higher for standard PC and 40–60°C for ezPC grades. Always start from the filament's technical data sheet.
When should I choose PC-CF filament over standard PC?
Choose PC-CF when you need stiffness, dimensional accuracy, and strength-to-weight, such as structural brackets and load-bearing fixtures. CarbonX PC+CF is about 2.5 times stiffer than unreinforced PC. Stay with standard PC when you need impact toughness and some flex, since carbon fiber makes a part more rigid but more brittle. PC-CF also requires a hardened steel nozzle because it is abrasive.
The short version
- PC fills the gap between PETG and ABS below it and PEEK or ULTEM above it, giving high heat resistance and impact strength without specialist hardware.
- It is stronger than PETG and ABS on tensile, impact, and heat resistance.
- It is demanding to print, but the difficulty comes down to drying, temperature, and warping control, all of which are manageable.
- Dry standard PC at 120°C for 4+ hours, then print at 280–310°C in a heated enclosure of 65°C or higher; ezPC dries at 80°C and prints at a lower chamber temperature.
- Choose PC-CF for stiffness and dimensional accuracy, and neat PC for impact toughness.
Shop polycarbonate and PC-CF filament from 3DXTECH
3DXTECH engineers high-performance polycarbonate for parts that have to hold up under heat and load. Explore the full range of PC and PC-CF filament, compare grades against your application, and pull the technical data sheets you need for your print profile. If you want a recommendation for a specific part, our materials team can help you match the right polycarbonate to the job. Browse the polycarbonate filament lineup to get started.
