why does the temp on the spool say 240c to 260c?

I have printed 5 spools of this. I'll be buying it again. This s a Nylon filament (probably PA6). It needs to be dry and it prints great for me at 250-255 on my Ender 3 with an E3Dv6 hotend. I print to clean Garolite (no glue or slurry, etc.) It will wear a brass nozzle to the point you may need to boost flow rate to compensate. Cooling fan not needed. Great matt surface finish. The thermal difference between the top layers at 240+ and the first layers now cooled to bed temp will cause great stress making it a challenge to keep parts from lifting; using extra brim or tabs helps. Designing for thermal stress mitigation may be more effective. Also, holds tapped M6 threads nicely to join parts.

It seems that all polyamides have a distinct number, like pa66, etc. i can't find anywhere where there's a description of "pa" used by itself?

This filament uses a PA 6/66 copolymer for the nylon component.

The picture shows 240c to 260c but the description says 260c to 290c. which is correct?

You can use the temperature in the description.

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eSUN Carbon Fiber Filled Nylon Filament 1.75mm PA CF 3D Printer Filament 1KG Spool for 3D Printers, Natural

Product ID: 725904856

Details

Brand
eSUN
Material
Carbon Fiber
Color
natural
Item Weight
1 Kilograms
Item Diameter
1.75

🔥Heat resistant to 120°C

🧵1.75mm diameter ±0.05mm tolerance

⚙️80% nylon + 20% carbon fiber composite

Description

⚡ Elevate your 3D prints with carbon fiber strength and precision!

PRECISION PERFECT - Tight diameter tolerance (+/- 0.05mm) ensures smooth, consistent extrusion with zero jams or tangles.
UNMATCHED DURABILITY - Carbon fiber reinforcement delivers superior rigidity and abrasion resistance for industrial-grade prints.
HEAT WARP RESISTANT - Withstands up to 120°C and resists warping and creep, ideal for complex, high-performance parts.
VERSATILE COMPATIBILITY - Optimized for most FDM 3D printers using 1.75mm filament, perfect for prosthetics, medical devices, and industrial prototypes.
SEAMLESS PRINTING EXPERIENCE - Vacuum-sealed packaging with desiccant keeps filament dry and clog-free, guaranteeing flawless prints every time.

eSUN Carbon Fiber Filled Nylon Filament combines 80% nylon with 20% carbon fiber to create a heat-resistant, abrasion-proof, and warp-resistant 1.75mm filament spool. Engineered for high precision with ±0.05mm diameter tolerance and vacuum-sealed packaging, it ensures smooth, tangle-free printing compatible with most FDM 3D printers, ideal for demanding industrial and medical applications.

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Brand	eSUN
Model Number	ePA-CF175N1KG-US
Color	natural
Material Type	Carbon Fiber
Number of Items	1
Size	PA-CF Filament 1KG
Package Dimensions	21.5 x 20.6 x 7.4 cm; 1 kg

eSUN Carbon Fiber Filled Nylon Filament 1.75mm PA CF 3D Printer Filament 1KG Spool for 3D Printers, Natural

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