Hardened nozzles for the Bambu P1S: materials, sizes, and tips

The P1S ships with a 0.4 mm hardened steel nozzle as standard. So if you are wondering whether your stock nozzle is already hardened — it is. The question most people are actually asking is something else: do they need a replacement of the same type, a different diameter, or an upgrade to tungsten carbide for heavier abrasive work? Here is a plain-language rundown of what fits the P1S, when each option makes sense, and what to avoid.

Why the nozzle material matters

Brass nozzles — the type that ships with many budget printers — conduct heat well and cost almost nothing to replace. The problem is wear. The bore erodes quickly when you run abrasive filaments. Carbon fibre-filled material, glow-in-the-dark PLA (the glow pigment is aluminium oxide, which is genuinely abrasive), and metal or mineral composites all act like slow sandpaper on a brass bore. After enough abrasive filament, the orifice goes oval, flow becomes inconsistent, and no amount of calibration recovers it.

Hardened steel resists that wear far better. That is why Bambu chose it as the default for the P1S — a printer sold partly on its ability to handle engineering-grade materials. But even hardened steel is not the end of the story.

What the P1S nozzle system actually requires

The P1S uses Bambu's proprietary nozzle format. It is not a standard V6, MK8, or Volcano thread. A generic hardened nozzle from a multi-brand supplier will not fit without checking compatibility explicitly. The nozzle seats into Bambu's hot end with a specific geometry at the heat-break end. A poor fit at that interface causes filament to leak back into the hot end — messy, difficult to clean, and potentially damaging to the heater block.

When you buy any nozzle for the P1S, the listing needs to say Bambu P1S / P1P / X1C compatibility. These three models share the same hot end format, so a nozzle listed for any one of them fits all three.

Nozzle materials: what is actually available

Hardened steel is the right choice for most P1S printing. It handles CF-filled filaments, glow-in-the-dark, wood-fill, and metal composites without wearing quickly. The only practical trade-off versus brass is that hardened steel conducts heat less efficiently. You may need to increase your print temperature by 5-10 °C compared to what you ran with brass. Bambu's own filament presets are tuned for their hardened steel nozzle, so if you are printing Bambu-branded filament you will likely be close already. Third-party filament presets sometimes assume brass, so tweak upward and run a quick flow calibration.

Tungsten carbide is the meaningful upgrade from hardened steel. Bondtech, Micro-Swiss, and several Chinese manufacturers (Trianglelab, Phaetus) produce tungsten carbide nozzles in Bambu-compatible format. Tungsten carbide is significantly harder than hardened steel and actually conducts heat slightly better than steel — so you need less temperature correction than with a standard hardened nozzle. The lifespan with abrasive filaments is substantially longer, to the point where many users treat a tungsten carbide nozzle as semi-permanent. The downside is cost: a tungsten carbide nozzle is noticeably more expensive than a hardened steel one. If you occasionally print CF parts, hardened steel is fine. If abrasive filament is your everyday material, tungsten carbide pays for itself.

Brass is still available in Bambu-compatible format and is the better choice if you only print non-abrasive filaments. For PLA, PETG, ABS, and TPU, brass transfers heat slightly more efficiently and costs less. Many users keep a brass nozzle for standard work and only swap to hardened steel when they load CF or glow spools.

High-flow nozzles (Bondtech CHT-style) are a separate category with a multi-channel bore that improves melt throughput. They are available in Bambu-compatible format in both brass and hardened steel. If you are already printing at high speed and want to add abrasive filament capability, a hardened-steel CHT covers both at once.

Nozzle sizes for the P1S

Bambu sells their nozzles in 0.2, 0.4, 0.6, and 0.8 mm diameters. Third-party options typically cover the same range.

The 0.4 mm is the right starting point for most prints. Go to 0.2 mm only if you need very fine detail and are prepared for much slower print times. Go to 0.6 or 0.8 mm for structural parts where layer adhesion matters more than surface resolution, or for high-flow abrasive work where you want fewer passes over the part.

Larger nozzles need updated slicer profiles. Bambu Studio and Orca Slicer both support the P1S across all diameters, but you must set the correct diameter in your printer configuration — the slicer does not detect it automatically.

Official Bambu nozzles vs third-party

Bambu's own hardened steel nozzles are the safest starting point. The fit is guaranteed, the geometry is correct, and they are reasonably priced. If you want a like-for-like replacement of the stock nozzle, start here.

Reputable third-party options (Bondtech, Micro-Swiss, Trianglelab) extend your choices — particularly for tungsten carbide, high-flow bores, or less common diameters. These work well if the listing is specific about P1S compatibility. Be more cautious with cheap, unbranded nozzles claiming Bambu compatibility. An incorrect geometry at the heat-break interface is not immediately obvious and can cause problems that are slow to diagnose.

Signs your nozzle needs replacing

A worn nozzle is easy to misread as a profile problem or a clog. Look for:

• Persistent under-extrusion that survives recalibration and a cold pull
• Inconsistent line width, especially visible on single-perimeter walls
• Surface finish that has degraded gradually rather than suddenly
• Visible wear at the nozzle tip — a rounded or flattened orifice where it should be flush

If you have been running CF filament for a few hundred grams and quality starts dropping, replace the nozzle before chasing software fixes.

How to swap the nozzle on a P1S

1. Use the P1S maintenance menu to start a nozzle-change sequence. This heats the hot end and runs a purge automatically — use it rather than heating manually. 2. Once at temperature, use the nozzle wrench from the P1S toolkit. Hold the heater block steady with a second spanner to avoid stressing the heat-break connection. 3. Unscrew the nozzle anticlockwise. It is hot. Use heat-resistant gloves. 4. Thread the replacement in while the block is still warm (above 170 °C): finger-tight first, then firm with the wrench. Do not overtighten. 5. Purge 30-50 mm of filament before your next print to clear any debris and confirm clean flow.

Do not attempt a nozzle swap cold. A cold nozzle risks seizing on the thread, which can damage the heater block — a longer and more expensive repair than the nozzle swap you were trying to do.

When to get it printed instead

If you need parts in carbon-fibre-filled nylon, CF-PETG, or other abrasive engineering materials but are not ready to commit to a nozzle upgrade, we can print them for you at Hark Tech. Our machines run the right nozzle for the material, and we deal with calibration and wear on our end. Upload your file at /printing.html, choose your material, and we will get a quote back to you within a few working days. It is a straightforward option if you have a one-off structural part to make and do not want to modify your own printer for a single job.