Learn · updated 2026-09-24
Do I need a hardened nozzle?
Short answer
Only if you print filled filament — anything with carbon fibre, glass fibre, glow-in-the-dark or metal in it. Those destroy a brass nozzle quickly. Plain PLA, PETG and ABS do not need one.
What abrasive filament does
Carbon- and glass-filled filaments contain hard particles that scour the inside of the nozzle as they pass. Brass is soft, so the orifice widens and goes out of round — sometimes within a few hundred grams of filament. The symptom is a print that gradually loses dimensional accuracy and develops inconsistent extrusion width, which is easy to misdiagnose as a slicer problem. Glow-in-the-dark filament is the one that catches people out, because it does not sound abrasive and is among the worst.
Hardened, and what else needs to be
Hardened steel resists the wear but conducts heat less well than brass, so flow rates can be slightly lower. Bi-metal and tungsten-carbide-tipped nozzles are the compromise and are what most printers aimed at filled filament now ship with. The nozzle is not the only wear part, though: the extruder drive gears and any PTFE lining in the filament path also see the abrasive, and a machine designed around filled filament will have addressed all three rather than just the tip.
Which printers include one
A hardened nozzle fitted as standard is a reasonable signal that a printer was designed with filled filaments in mind rather than merely permitting them. Machines marketed for carbon fibre generally ship hardened; entry-level open-frame printers generally do not. Adding one afterwards is inexpensive — typically $10 to $25 — so this is a convenience and a design-intent signal rather than a hard barrier.
Do you actually want filled filament?
Carbon-filled materials are stiffer and hold their shape better under load, which is why they suit brackets and jigs. They are also more brittle, more expensive, need a higher hot-end temperature, and print with a matte finish that hides layer lines nicely. For decorative printing they are usually not worth the trouble; for functional parts that must not flex, they often are.