Nozzle materials and sizes — which one for which filament
A nozzle choice comes down to two questions: what is it made of and how wide is the hole. The material decides whether it survives abrasive filament and how well it carries heat; the diameter trades fine detail against speed and strength. This guide covers the commonly available options you can actually buy off the shelf — nothing exotic or locked to a single machine.
| Type | Suited materials | Abrasion | Heat flow | Cost |
|---|---|---|---|---|
| Brass | Non-abrasive: PLA, PETG, ABS, ASA, TPU | Low | Excellent | $ |
| Stainless steel | Non-abrasive; cleaner / lower-leaching prints | Medium | Moderate | $ |
| Hardened steel | Abrasive: CF/GF, wood, glow, metal-fill | High | Moderate | $$ |
| Plated / coated | Mild abrasives; all-round upgrade | Medium-high | Good | $$ |
| Ruby / sapphire tip | Abrasive + high quality, high temps | Extreme | Excellent | $$$$ |
| Tungsten carbide | Heavy abrasives, production use | Extreme | Good | $$$ |
| Plated copper | High-temp & high-speed (high-flow) | Medium | Best | $$$ |
What almost every printer ships with, and for good reason: brass conducts heat beautifully, so it melts filament evenly and keeps up at speed. It is also cheap enough to keep spares in a drawer. The catch is that it is soft — fine for plain plastics, hopeless against anything filled.
A middle option that resists wear better than brass and does not leach the trace metals brass can, which is why it shows up in food-contact and medical-leaning prints. It does not conduct heat as well as brass, so push the temperature up a touch for the same flow.
The practical answer for composite filaments. Heat-treated to shrug off abrasive particles, it lasts through spool after spool of carbon-fibre or wood-fill. Heat flow is lower than brass and the bore finish is slightly rougher, so expect to print a little hotter and see marginally more stringing.
Brass (or copper) with a hard, often nickel-based coating. The idea is to keep most of the base metal's heat flow while adding wear resistance and a slick surface that resists sticking. A sensible all-round step up — just remember the coating is thin, so heavy abrasives still win eventually.
A synthetic ruby or sapphire is set into the tip of a brass or copper body — so you get the conductivity of brass and a tip hard enough to print abrasives essentially for life. The downside is purely the price; they are also worth handling carefully, since the gem can crack if you crash the nozzle.
Carbide nozzles are about as wear-proof as it gets while still conducting heat reasonably well, which makes them a favourite for print farms running abrasives day in, day out. They cost less than a gem-tipped nozzle but more than hardened steel, and they are the safe choice when downtime to swap a worn nozzle is the real expense.
Copper carries heat even better than brass, so a plated copper nozzle keeps the melt zone hot at very high flow rates — the reason it pairs with high-temperature materials and fast, large-diameter printing. The plating adds modest wear resistance, but the real reason to buy one is throughput, not abrasion.
The hole width sets the trade-off between detail and throughput. A narrow nozzle lays finer lines and captures small features but prints slowly and gives weaker walls; a wide nozzle pushes far more plastic for strong, fast parts at the cost of crispness. 0.4 mm is the default for a reason — it balances both — but it pays to keep a couple of sizes on hand.
| Diameter | Detail | Speed | Strength | Best for |
|---|---|---|---|---|
| 0.2 mm | Very high | Slow | Low | Miniatures, fine detail |
| 0.4 mm | Good | Balanced | Good | Default all-rounder |
| 0.6 mm | Moderate | Fast | High | Functional parts |
| 0.8 mm | Coarse | Fast | High | Vases, large sturdy prints |
| 1.0 mm+ | Low | Very fast | Very high | Large-format, max throughput |
Hardened and stainless nozzles carry less heat than brass. If flow looks under-extruded after a swap, raise the temperature by roughly 5–10 °C rather than slowing down.
Even hardened nozzles dull over time. If detail softens, corners round off, or extrusion turns inconsistent for no clear reason, a worn or partially clogged nozzle is a likely cause — swapping one is cheap and quick.