PETG vs Polycarbonate: Printing Difficulty and Cost Tradeoffs

The Core Tradeoff at a Glance

PETG and polycarbonate are often mentioned in the same breath — both are engineering-grade materials that outperform PLA in toughness and heat resistance — but the gap between them in practical printability is enormous. PETG was designed partly to be printable: its glycol modification lowers the crystallization rate, reduces warping tendency, and puts it within reach of a heated-bed printer running a standard all-metal or PTFE-lined hotend at 240–250°C. Polycarbonate, by contrast, is an industrial thermoplastic that was not designed for FDM. Printing it reliably requires overcoming its high glass transition temperature (around 147°C), its hygroscopic nature, and its significant tendency to warp without active chamber temperature management.

The result: most people with a basic enclosed printer (Bambu Lab P1S, Prusa MK4S in an enclosure, Creality K1 Max) can reliably produce functional PETG parts on their first attempt. PC, particularly in pure form, often requires tuning over multiple prints before achieving good interlayer adhesion and a warp-free result — even on machines rated for it.

Print Temperature: The Most Immediate Difference

Across 128 standard PETG filaments in the database with print temperature data, the most common nozzle temperature window runs from 230°C to 260°C, with a population minimum of 200°C and a maximum of 290°C. Most consumer PETG filaments from established brands cluster tightly in the 230–255°C range: Polymaker PolyLite PETG specifies 230°C, Prusament PETG runs 250°C, and eSUN PETG spans 230–260°C. This temperature range is within the reach of virtually every PTFE-lined hotend, including those on budget printers — and well within the safe operating range for PTFE tubes (below 260°C).

PC is a different category. Across 57 standard PC filaments with temperature data, the print temperature range spans from 220°C to 420°C across the entire sample — but the realistic working range for quality parts is 260–300°C. Consumer-accessible PC products tend to sit at the lower end of this: Bambu Lab PC specifies 260–280°C, Polymaker PolyLite PC runs 250–270°C, and Overture PC Professional targets 250–270°C. Pure industrial-grade PC formulations like Prusament PC Space Grade specify 290°C. High-performance variants from engineering-focused suppliers like 3DXTech 3DXSTAT ESD-PC require 295°C, and CF-filled grades like 3DXTech CarbonX PC+CF demand 300°C.

This has a critical hardware implication: printing above 260°C with PTFE-lined hotends risks PTFE degradation and potential fluoropolymer off-gassing. PC essentially mandates an all-metal hotend — hardened steel or stainless. You cannot reliably print real PC on a printer with a PTFE-lined hotend without risking both print quality and your health.

Bed Temperature and Warping

PETG is forgiving on bed adhesion. Across standard PETG filaments, bed temperatures range from 0°C (some brands print on cold beds) to 110°C, but the practical sweet spot is 70–85°C. PETG adheres well to PEI surfaces, glass, and most textured plates. It tends to over-adhere to bare glass if printed too hot at the bed. Warping is rarely a concern with PETG for parts under 200mm in any dimension — the low shrinkage rate during cooling means first-layer adhesion is typically enough to hold the part flat.

PC presents a far more demanding bed temperature profile. Across standard PC filaments, bed temperatures range from 50°C to 180°C. The realistic working range for standard PC is 100–130°C: Prusament PC Blend specifies 110°C, Prusament PC Space Grade needs 120°C, and 3DXTech CarbonX PC+CF requires 140°C. These temperatures push the limits of many heated beds — and even with a proper bed temperature, PC's higher thermal expansion coefficient means large parts are prone to corner lifting and delamination without an enclosed, actively heated chamber.

The enclosure requirement for PC is real. Without maintaining the ambient temperature around 40–60°C during printing, the temperature differential between the nozzle and the surrounding air causes rapid cooling of deposited layers. This differential induces internal stresses that manifest as warping, cracking between layers, or outright part failure. PETG has no meaningful enclosure requirement for the vast majority of applications.

Mechanical Properties: Where PC Earns Its Price

The mechanical gap between PETG and PC in the database is substantial and consistent across multiple properties.

Tensile strength: Standard PETG averages 48.4 MPa across 90 filaments with data. Standard PC averages 67.0 MPa — a 38% increase. Individual product data reinforces this: Polymaker PolyMax PC is rated at 53.4 MPa, Polymaker PolyLite PC at 69.1 MPa, and Overture PC Professional at 70.2 MPa. Prusament PC Space Grade reaches 72 MPa. The highest PC values come from CF-reinforced grades: 3DXTech CarbonX ezPC+CF is rated at 73 MPa. Meanwhile, the strongest standard PETG filaments top out around 55–56 MPa: Sunlu PETG is rated at 55 MPa and 3DJAKE easyPETG at 53 MPa.

Flexural modulus (stiffness): Standard PETG averages 1,824 MPa in flexural modulus. Standard PC averages 3,402 MPa — roughly 86% stiffer on average. This difference is perceptible: PC parts have a distinctly more rigid feel and resist deflection under load much better than PETG equivalents at the same geometry. For snap-fit designs, thin-wall brackets, or structural frames, the stiffness gap is meaningful.

Elongation at break: PETG averages 45.1% elongation, PC averages 29.6%. PETG is the tougher, more ductile material — it bends before it breaks, making it better for impact absorption in situations where the part can deform slightly. PC is stronger but less ductile in FDM form (bulk PC is famously tough, but FDM layer adhesion limits ductility).

Flexural strength: PETG averages 74.2 MPa; PC averages 120.2 MPa — a 62% advantage for PC. This is particularly relevant for bending loads, cantilevered parts, and anything subjected to sustained flexural stress.

Heat Resistance: The Biggest Performance Gap

Heat deflection temperature is where the PETG vs PC decision often resolves itself clearly. Standard PETG averages 70.9°C HDT across 64 filaments with HDT data. Standard PC averages 115.0°C HDT across 41 filaments. That 44°C difference is enormous in practical terms.

PETG's 70°C average HDT means it softens under load in environments that regularly exceed summer car interior temperatures (80–100°C on hot days). You cannot reliably use standard PETG near heat-generating electronics, in underhood automotive applications, or anywhere that sustained temperatures above 60–65°C are expected. Individual PETG products vary: Polymaker PolyLite PETG is rated at 78°C HDT, Sunlu PETG at 68°C, and eSUN PETG at 64°C.

PC at 115°C average HDT comfortably handles environments that would destroy PETG. Bambu Lab PC is rated at 117°C HDT, Prusament PC Blend at 113°C, Polymaker PolyMax PC at 114°C, and Polymaker PolyLite PC at 111°C. Higher-end formulations push further: 3DXTech Triton PC (Stratasys) achieves 138°C HDT, and Prusament PC Space Grade reaches 137°C. These levels approach HT-PLA and ASA territory for heat resistance — from a material that also provides much higher strength.

Moisture Sensitivity: A Hidden Cost of PC

Both PETG and PC are hygroscopic — they absorb moisture from ambient air — but PC is considerably more sensitive. Wet PC filament produces stringing, bubbling, poor layer adhesion, and surface defects that can make parts structurally compromised even when they look acceptable. The Filabase materials database doesn't currently include moisture absorption rates, but the practical consequence is documented across manufacturers' technical sheets: most PC filament brands recommend drying at 80–90°C for 6–8 hours before printing if the spool has been exposed to air. Some, including Prusament, ship in vacuum-sealed packaging and recommend printing directly from a sealed container or active dryer.

PETG also benefits from drying (most brands recommend 65–70°C for 4–6 hours if performance is degraded), but it's more forgiving of modest humidity exposure. In a typical home environment without aggressive humidity control, PETG from a freshly opened spool can usually be printed without drying. PC generally cannot. This adds cost in the form of a filament dryer ($30–100), electricity, and time — particularly if you're running multiple materials and need to switch between them.

Cost Comparison

The Filabase database doesn't include current retail pricing, but the market pricing structure for these materials is well-established. Standard PETG from mainstream brands (eSUN, Hatchbox, Sunlu, Overture) typically retails for $18–28 per 1kg spool — comparable to PLA and substantially lower than engineering materials. Premium PETG from brands like Prusament or Polymaker runs $25–35/kg.

Standard PC costs roughly 2–4x more per kilogram than PETG. Consumer-accessible PC from brands like Bambu Lab, Sunlu, or Polymaker typically retails for $40–60/kg. Engineering-grade and specialty PC from suppliers like 3DXTech or Polymaker's PolyCore line runs $60–100+/kg. PC/ABS blends (PolymerFamily PC in the database) offer a middle ground — somewhat easier to print than pure PC and available for $30–50/kg — but they don't match pure PC's thermal performance.

The filament cost difference is often not the dominant cost consideration when choosing PC. The real added cost comes from hardware requirements: an all-metal hotend ($20–60 upgrade or built-in on Bambu Lab, Voron, etc.), a reliable enclosure (built-in on some machines; an aftermarket addition costing $50–200 on others), and a filament dryer. For hobbyists who already have an enclosed, all-metal-hotend machine — or who are buying a printer specifically for engineering materials — PC's cost premium over PETG is mainly the filament price itself. For those on a budget printer without these features, the hardware upgrade cost to print PC reliably can easily exceed $100–200.

Printer Requirements: A Practical Checklist

Here is what printing each material reliably requires:

PC/ABS Blends: A Middle Path?

Several entries in the PC category in this database are PC/ABS blends rather than pure polycarbonate. These include Polymaker PC-ABS (tensile strength: 39.9 MPa, HDT: 111.7°C, print temp: 250°C, bed: 90–105°C), Fillamentum PC/ABS (42 MPa tensile, 260–280°C), and Sunlu PC-ABS (40 MPa, HDT: 102°C, 260–280°C). These blends are meaningfully easier to print than pure PC — they warp less, require lower bed temperatures, and are more forgiving of open-air printing — while retaining some of PC's heat resistance advantage over PETG.

The tradeoff: PC/ABS tensile strength is similar to PETG (40–42 MPa vs PETG's 48 MPa average), and heat resistance is lower than pure PC but still well above PETG (102–112°C HDT vs PETG's 71°C average). If you need better heat resistance than PETG but aren't willing to commit to a full PC printing setup, PC/ABS blends occupy a useful intermediate position — though pure PETG's printability advantage over PC/ABS is less dramatic than over pure PC.

When to Use Each Material

Choose PETG when:

• Operating temperatures will stay below 65–70°C
• You need good chemical resistance (PETG resists most mild acids, bases, and alcohols)
• Printing on a stock or entry-level printer without an all-metal hotend
• Cost is a significant factor and you need multiple kilograms
• Transparency or translucency is desired (PETG prints semi-transparent naturally)
• You value ease of printing over maximum performance

Choose PC when:

• Parts will be exposed to temperatures above 80°C (electronics enclosures, automotive applications, LED fixtures)
• You need maximum tensile or flexural strength in FDM-printed parts
• Impact resistance at elevated temperatures is required
• You have an all-metal hotend, a heated enclosure, and a filament dryer
• The application justifies the higher filament cost and additional setup complexity

Comparison Table: PETG vs PC Key Metrics

For more comparisons involving these materials, see our PC vs Nylon vs PETG strength and temperature comparison and our Nylon vs Polycarbonate strength comparison. If you're deciding between PETG and a simpler material, see our PLA vs PETG guide.