3D printer nozzle types: which one do you need?
The nozzle is a small, cheap part that decides a lot: which filaments you can print, how fine the detail is and how fast you can go. Many printers ship with a brass 0.4 mm nozzle, which is the right choice for PLA, PETG, ABS and TPU. Abrasive filaments, food contact parts and very fine or very fast printing are the reasons to change it. This guide covers the common nozzle materials, which filaments need a wear resistant one, and when to use each size.
Nozzle materials compared
Nozzle materials trade two properties against each other: how well they conduct heat into the filament, and how well they resist being worn away by hard particles in it. Brass is excellent at the first and poor at the second. Hardened steel is the reverse. Most premium nozzles are attempts to get both.
| Material | Heat transfer | Wear resistance | Cost | Best for |
|---|---|---|---|---|
| Brass | Excellent | Low | Lowest | PLA, PETG, ABS, ASA, TPU |
| Plated copper | Excellent | Low to moderate | Moderate | High temperature and high flow printing |
| Stainless steel | Poor | Moderate | Low | Lead free prints, light wood fills |
| Hardened steel | Poor | High | Low to moderate | Carbon fiber, glass fiber, glow in the dark |
| Ruby tipped or tungsten carbide | Good to excellent | Very high | Highest | Heavy abrasive use at full speed |
Brass
The traditional default and still the stock nozzle on many printers, although some current machines, including several Bambu Lab models, ship with stainless or hardened steel instead. Brass conducts heat very well, so it melts filament evenly at the temperatures printed on the spool, and it is cheap enough to treat as a consumable. Its weakness is softness: abrasive filaments grind the bore out of round, and the result is under extrusion and poor surfaces. Prusa's knowledge base describes brass as fine for most common filaments but too quick to wear with abrasive ones.
Plated copper
Copper alloy nozzles with a protective plating conduct heat even better than brass and resist plastic sticking to the tip. They suit high temperature materials and high flow printing. Plating adds some protection, but a plated copper nozzle is not a substitute for a hardened one on carbon or glass fiber filament. E3D states that its Nozzle X was created to address the poor abrasion resistance of plated copper and brass.
Stainless steel
Stainless steel is harder than brass and handles occasional mildly abrasive filament such as wood fill, but it is not meant for regular carbon or glass fiber use. It conducts heat worse than brass, so you may need to raise the print temperature a little. Its main reason to exist is that it is lead free, which matters for food contact prints (see below).
Hardened steel
Tool steel that has been heat treated for hardness. Hardened steel nozzles, such as Micro Swiss's plated A2 and Slice Engineering's Vanadium, are the standard budget answer for abrasive filaments and last far longer than brass on them. The catch is heat transfer. Steel conducts heat much worse than brass, so most makers and users raise the nozzle temperature by about 5 to 10°C, and your maximum volumetric flow may drop. Slice Engineering, for example, notes that Vanadium nozzles need that 5 to 10°C increase.
Ruby tipped and tungsten carbide
Ruby nozzles, such as the Olsson Ruby, set a synthetic ruby tip into a mostly brass body. Tungsten carbide nozzles are usually machined from solid carbide, which conducts heat far better than steel. Either way you get wear resistance well beyond hardened steel with heat transfer much closer to brass, so you do not have to raise temperatures or slow down for abrasive filament. They cost several times as much as a hardened steel nozzle, which pays off only if you print a lot of filled material. Newer copper alloy designs with hard coatings or inserts, such as E3D ObXidian and Slice Engineering GammaMaster, aim for the same balance.
Which filaments need a wear resistant nozzle
A filament is abrasive when it contains hard particles mixed into the plastic. Plain PLA, PETG, ABS, ASA, TPU, nylon and PC are not abrasive and print fine through brass. These are the ones that need hardened steel or better:
Carbon fiber filled
PLA-CF, PETG-CF, PA-CF and other carbon fiber blends wear out brass quickly. A hardened nozzle is mandatory. See the carbon fiber filament guide.
Glass fiber filled
Glass fiber is also highly abrasive. Treat PETG-GF, PA-GF and similar blends the same way. See the glass fiber filament guide.
Glow in the dark
The phosphorescent powder that makes it glow is hard, and nozzle makers such as Micro Swiss list glow in the dark alongside carbon fiber as an abrasive filament. How fast it wears brass depends on the brand and pigment, so it is easy to underestimate because the filament looks like ordinary PLA. If you print it regularly, use a hardened nozzle.
Metal and some wood fills
Metal filled filaments such as bronze, brass and copper fill are abrasive. Wood fills vary: many are only mildly abrasive, but a hardened or stainless nozzle is the safer choice if you print them often. Wood and metal fills also clog small nozzles easily, so 0.4 mm or larger is the usual advice.
Why not just run hardened steel all the time?
You can, and some printers ship with one. The cost is a slightly higher print temperature and a little less maximum flow. If most of your printing is PLA and PETG, a brass nozzle for everyday work plus a hardened one you swap in for filled filaments gives the best of both.
Tradeoffs to plan for
Temperature
With hardened or stainless steel, start about 5 to 10°C above your brass temperature and adjust from there. Ruby, carbide and coated copper nozzles generally print at brass temperatures.
Speed and flow
Because steel moves heat into the filament more slowly, it can limit how much plastic per second the hotend can melt. This matters most on fast printers.
Cost and lifespan
Brass nozzles are cheap and last a very long time on non abrasive filament. Hardened steel costs a bit more and lasts far longer on abrasive filament. Ruby and carbide nozzles cost the most up front but are designed to hold their bore size over a very long service life.
Food contact and lead in brass
Free machining brass, the alloy most nozzles are made from, usually contains a small percentage of lead to make it easier to cut. Trace amounts can end up in the extruded plastic. For decorative parts this is not a practical concern, but if you are printing anything meant to touch food, a stainless steel nozzle removes that source of lead. Hardened steel is not automatically lead free either, since some tool steels contain it, so check the maker's specification.
A lead free nozzle is only one piece. The filament itself needs to be suitable, and layer lines trap bacteria no matter what nozzle you use. The food safe filament guide covers the rest.
Nozzle sizes: 0.2, 0.4, 0.6 and 0.8 mm
Diameter sets the tradeoff between detail and speed. A useful rule from Prusa is that the maximum practical layer height is about 80% of the nozzle diameter, so a 0.4 mm nozzle tops out around 0.32 mm layers and a 0.6 mm around 0.48 mm.
0.2 mm (and 0.25 mm)
For very fine detail: small text, jewelry and tabletop models. Prints take several times longer and small nozzles clog more easily, so avoid filled filaments and flexible TPU. The filament for miniatures guide covers materials that suit fine nozzles.
0.4 mm
The standard size shipped on almost every printer. It balances detail and speed well and works with nearly every filament. Stay here unless you have a specific reason to change.
0.6 mm
Noticeably faster with stronger, thicker walls, at the cost of fine detail. A popular choice for functional parts and for carbon or glass fiber filaments, since the wider bore is less prone to clogging.
0.8 mm
For large, rough parts and vases where speed matters more than surface finish. Your hotend needs enough melt capacity to keep up, otherwise you will not get the full speed benefit.
Compare Carbon Fiber Filament Prices
Fitted a hardened nozzle? Compare live carbon fiber filament listings by brand, weight and price per kg before you buy your first spool.
Compare Carbon Fiber Filament Prices