Polycarbonate (PC) Filament:
The Complete Printing Guide

What Is Polycarbonate Filament?

Polycarbonate is a thermoplastic used in bulletproof glass, riot shields, aircraft canopies, and the visors of safety helmets. In filament form, it brings those same properties — extreme impact resistance, high heat deflection, and optical clarity — to desktop 3D printing. Printed PC parts can survive mechanical abuse that would crack ABS and catastrophically shatter PLA.

The key properties that matter for functional printing:

• Impact resistance: PC absorbs impact energy far better than any other common FDM material. Parts that need to flex slightly before absorbing a blow — enclosure clips, mounting brackets, protective covers — benefit most from PC.
• Heat deflection temperature (HDT): PC holds its shape up to approximately 110–130°C under load, compared to around 80–100°C for ABS and 55–75°C for PETG. Under-engine mounts, lighting housings, and automotive trim parts that see real heat are valid PC use cases.
• Optical clarity: Pure, unfilled PC prints clear — not glass-clear, but translucent enough for light-pipe applications, lens housings, and diffuser panels. No other common FDM filament comes close on optical transmission.
• Dimensional stability: PC has low creep under sustained load, meaning parts stay in shape rather than slowly deforming over time, which matters for press-fit assemblies and precision jigs.

The caveat is that PC needs high printing temperatures — typically 280–300°C — and is sensitive to cooling rate. Print it fast, cool it aggressively, or expose it to drafts while it's still hot, and it will warp. Print it right, and it produces some of the most mechanically capable parts achievable on a consumer FDM printer.

When to Use PC — and When Not To

PC is not an everyday material. It costs more than ABS or PETG, requires more setup, and demands an enclosed printer. Use it when you have a genuine reason.

Good reasons to reach for PC:

• The part needs to survive drops, knocks, or repeated impacts without cracking
• Operating temperatures above 90°C that rule out PETG and challenge ABS
• Transparency or light transmission is a design requirement
• Long-term dimensional stability under sustained load
• The part contacts fuels, oils, or mild chemicals that degrade ABS

When to use something easier instead:

• Decorative or low-stress structural parts — PLA or PETG are faster and cheaper
• Outdoor UV exposure — ASA holds up better in sunlight; PC yellows and degrades under prolonged UV
• You don't have an enclosed printer — warping on open-frame machines is nearly unavoidable
• High-volume printing where cost matters — ABS at half the price often gives 80% of the performance

Hardware Requirements

Printer: Enclosure Is Non-Negotiable

PC shrinks significantly as it cools from the ~280°C nozzle to ambient temperature. Without an enclosure maintaining a consistent warm chamber (40–60°C), the base layers cool before the upper layers are laid down, creating internal stresses that curl the part off the bed. On open-frame printers like the Bambu Lab A1 Mini or A1, this is essentially a guaranteed failure for anything larger than a small coin.

The enclosed Bambu Lab machines — the P1S, X1 Carbon, and P2S — are all well-suited to PC. The P1S and X1C reach 45–55°C chamber temperatures passively through the heated bed and nozzle, which is enough for most PC work. The X1C's active chamber temperature reporting gives you more confidence that conditions are stable before you commit to a long print.

Nozzle: Hardened Steel Recommended

Pure polycarbonate is not abrasive in the way that carbon-fiber or glow-in-the-dark filaments are. A brass nozzle technically won't be destroyed by PC in a single spool. The practical reason to upgrade anyway is temperature: at 280–300°C, brass oxidises faster and can leave trace contamination that shows up in optically clear PC prints as a yellow tinge. A hardened steel or stainless steel nozzle runs cleaner at these temperatures and is the right long-term choice if you're going to print PC regularly.

For Bambu Lab printers, the 0.4mm hardened steel CHF nozzle is the natural choice. See our Bambu Lab Nozzle Guide for a full breakdown of nozzle materials and when each is appropriate.

Build Plate: High-Temp or Textured PEI

PC won't adhere reliably to a standard Cool Plate. The Bambu High-Temp Plate is the first choice for PC — it handles 100–110°C bed temperatures without issue, and PC sticks to it well with a light glue stick application. The Textured PEI Plate also works at lower bed temperatures (around 80–90°C) with a glue-stick release layer, though large flat prints are more prone to adhesion failure without the high-temp plate. Avoid the smooth Cool Plate and Engineering Plate for PC.

Print Settings for PC on Bambu Lab

OrcaSlicer ships with a PC filament preset for Bambu Lab's enclosed printers. Use it as your starting baseline — the stock Bambu Lab PC profile is well-calibrated for their own filament. If you're running a third-party PC, the preset is still a solid starting point with the adjustments below.

• Nozzle temperature: 280–300°C. Start at 280°C for thinner walls and detail work; go up to 290–300°C for thick walls and layer adhesion on functional parts. Higher temperatures improve layer bonding but increase stringing.
• Bed temperature: 100–110°C. The full 110°C on a High-Temp plate gives the best first-layer adhesion and helps keep the chamber warm. Use 80–90°C with a Textured PEI plate and glue stick.
• Enclosure temperature: Keep the chamber at or above 40°C before starting. With the P1S or X1C running at 110°C bed temperature, you'll naturally hit 45–55°C chamber temperature — that's where you want it.
• Part cooling fan: Off, or a maximum of 10–20% on bridging. PC warps when cooled aggressively. Fan-off is the default; add a touch of fan only on long bridges where layer sag is otherwise a problem.
• Print speed: 80–120mm/s for perimeters; 100–150mm/s for infill. PC has a high melt viscosity — pushing it faster than this leads to under-extrusion. This is one of the slower materials in the Bambu Lab ecosystem.
• Layer height: 0.15–0.25mm. Thicker layers improve layer-to-layer bonding in PC, which is important for impact resistance. Avoid 0.08–0.10mm layer heights unless you specifically need fine detail; they reduce strength.
• Wall count: 3–4 minimum for functional parts. PC's impact resistance scales with wall count more than most other materials — a 4-wall PC print absorbs far more energy than a 2-wall one.
• Brim: 5–8mm brim on any print with a footprint smaller than the full bed width, or any print with overhanging edges. PC peels from the corners even with good bed adhesion; a brim buys insurance.
• Infill: Gyroid or cubic at 30–50% for load-bearing parts. Grid or lightning for non-structural geometry. PC's strength comes mostly from walls and layer count, not infill density.

Drying & Storage

PC is highly hygroscopic. Even a few hours in humid air is enough to noticeably degrade print quality — the water trapped in the filament turns to steam at nozzle temperatures, creating bubbles, rough surface texture, weak layer bonds, and audible crackling from the hot end. Any PC that's been sitting in open air for more than a couple of hours should be dried before printing.

• Drying temperature: 80°C
• Drying time: 8–12 hours for a standard 1kg spool. Extend to 12–16 hours for spools that have been open for several days.
• Method: A dedicated filament dryer running at 80°C is the cleanest option. A food dehydrator with accurate temperature control at 80°C also works. A household oven at 80°C works in a pinch, though oven temperature accuracy varies — verify with an oven thermometer.
• Storage: Keep dried PC in a sealed bag or airtight container with fresh desiccant. After drying, PC will reabsorb meaningful moisture within a few hours in a humid environment.
• During printing: If you have a filament dryer that can feed into the AMS or directly to the printer, use it. For long PC prints, printing straight from a dry box is significantly more reliable than relying on a pre-dried spool sitting open on the printer.

For more on drying methods and temperatures across all filaments, see our How to Dry Filament guide.

PC vs Other Engineering Filaments

The key takeaway from that table: PC is the right choice when you need impact resistance, heat resistance, or optical clarity simultaneously. If you only need heat resistance and don't care about the other two, ASA or high-temp Nylon might serve the purpose at lower difficulty. If you only need good impact resistance, ABS is easier and cheaper. PC earns its difficulty when multiple properties matter at once.

Troubleshooting PC Prints

Warping and Corner Lifting

This is the most common PC failure mode. The usual causes in order of likelihood: the chamber wasn't warm enough before printing started, the part cooling fan was set too high, the brim wasn't wide enough, or the bed temperature was too low. Check the chamber pre-heat routine, set the fan to 0%, and add a 6–8mm brim before trying again. If warping persists on large flat parts, apply glue stick to the build plate even if you're using the High-Temp Plate.

Layer Delamination

Layers separating or peeling apart indicate the nozzle temperature is too low, the print speed is too high, or the cooling fan is running when it shouldn't be. Try bumping nozzle temperature by 5–10°C, dropping print speed by 20%, and confirming the fan is off. Layer delamination in PC significantly reduces impact strength, so it's worth diagnosing properly rather than just printing around it.

Stringing and Oozing

PC's low viscosity at high temperatures means retraction settings matter. Start with 0.5–0.8mm retraction at 40–45mm/s on Bambu's direct-drive hotend. Increase retraction distance slightly if stringing persists. Excessive retraction (above 1.5mm) can cause heat creep at 280°C+, so find the minimum retraction that controls stringing rather than maximising it.

Rough Surface / Crackling Noise

Wet filament. Stop the print, dry the spool at 80°C for 10–12 hours, and restart. There's no other fix — wet PC will always print badly, and more retraction or speed adjustments won't solve a moisture problem.

Best PC Filaments to Buy

Diameter consistency matters more for PC than for forgiving materials like PLA. PC's high melt viscosity means small diameter deviations show up immediately as flow rate inconsistencies and surface defects. Stick to brands with published diameter tolerances of ±0.02mm or better.

A note on PC blends: many filaments marketed as "PC" are actually PC-ABS blends, which print at lower temperatures (240–260°C) and don't need as warm a chamber. They're significantly easier to print than pure PC and are a reasonable intermediate step if you're new to engineering materials. The trade-off is reduced heat resistance (closer to ABS than pure PC). If you specifically need the 110–130°C HDT that makes pure PC worth the trouble, verify the filament is unfilled, unblended PC before buying.