Everyday printing: 0.4 mm stainless steel. Carbon fiber, glass fiber or glow filament: hardened steel. Faster large parts: 0.6 mm. Miniatures: 0.2 mm. Hotends are series-specific: a P1/X1 hotend does not fit an A1, and neither fits an H2 Series, P2S or X2D.
Most Bambu Lab owners never touch the nozzle until it clogs, wears out, or a filament demands something different. On Bambu printers the nozzle and hotend are sold together and are specific to a printer series, so the real questions are which size, which material and which series. This guide answers all three.
In this guide
- How a Bambu Lab hotend is built
- Nozzle sizes compared
- Hardened steel vs. stainless steel
- Which hotend fits which printer
- Coming soon: ObXidian, Tungsten Carbide and Vortek
- The silicone sock
- Which nozzle should you buy?
- FAQ
How a Bambu Lab hotend is built
A Bambu hotend has three zones. The cold end keeps filament solid as it feeds down from the extruder, with a dedicated fan on the left of the toolhead to stop heat creeping upward. The hot end is the heater block and nozzle, where filament melts. Between them sits a titanium alloy thermal break, a poor conductor that keeps heat in the melt zone. Heat creep, where filament softens too early and jams, is a common cause of clogs on any printer, and this separation is what prevents it.
Nozzle sizes compared
Diameter is the main trade-off between speed and detail. A larger nozzle lays wider lines and thicker layers, so the same job finishes faster. A smaller one resolves finer features. The ranges below follow Bambu's own nozzle overview.
| Size | Best for | Typical layer height | Trade-offs |
|---|---|---|---|
| 0.2 mm | Miniatures, small text, fine detail | 0.05 to 0.12 mm | Slow. Higher clog risk. Needs dry, good-quality filament. |
| 0.4 mm | Almost everything | 0.1 to 0.3 mm (0.2 mm default) | The balance point. Use hardened steel for fiber-filled filament. |
| 0.6 mm | Large functional parts, jigs, faster drafts, CF filaments | 0.15 to 0.45 mm | Visible layer lines. Less fine detail. |
| 0.8 mm | Big structural parts, vase mode, fastest drafts | 0.2 to 0.6 mm | Rough surfaces. Not for detail work. |
For most people 0.4 mm covers the large majority of prints. Move to 0.6 mm when print time matters more than surface detail, and use 0.2 mm only when the model needs it. On H2 Series, P2S and X2D printers you can also pair a size with a High Flow hotend if you are limited by melt rate.
Hardened steel vs. stainless steel
Stainless steel (gray heat-dissipation fins) is the standard material on most Bambu printers. It handles heat well, resists corrosion and lasts a long time on non-abrasive filament: PLA, PETG, ABS, ASA, TPU and PVA without additives.
Hardened steel (black fins) is for filament that contains hard particles. Carbon fiber, glass fiber, glow-in-the-dark pigment and metal fill act like sandpaper on soft metal. The particles do not melt, so they wear the bore larger and less round, and prints start to drift oversize, lose top-surface quality and under-extrude. Hardened steel lasts many times longer. Our hardened nozzle guide lists every filament and which side it falls on.
| Filament | Nozzle | Notes |
|---|---|---|
| PLA, PETG, ABS, ASA, TPU (unfilled) | Stainless steel | No upgrade needed. |
| Bambu PLA-CF, PETG-CF | Hardened steel, 0.4 mm | Approved by Bambu for 0.4 mm hardened steel. |
| Third-party PLA-CF, PETG-CF | Hardened steel, 0.6 mm | More clearance for longer fibers. |
| PET-CF, PA6-CF, PA6-GF, PAHT-CF, PPA-CF, PPS-CF | Hardened steel, 0.6 mm preferred | Engineering materials. Check printer support and drying requirements first. |
| Glow-in-the-dark | Hardened steel | Very hard pigment. |
| Metal fill, wood fill (high %) | Hardened steel | Metal fill is the harsher case. |
Official hardened steel hotend for P1P, P1S and X1C.
Which hotend fits which printer
This is where most wrong orders happen. Hotends are not cross-series compatible, so buy the one labeled for your series. Fit and maximum temperatures below follow Bambu's nozzle overview.
| Hotend | Fits | Max temp | Sizes |
|---|---|---|---|
| P1 / X1 hotend ($17.99) | P1P, P1S, X1C | 320 °C | 0.2 mm stainless; 0.4, 0.6, 0.8 mm hardened steel |
| A Series hotend ($14.99) | A1, A1 Mini, A2L | 300 °C | 0.2 and 0.4 mm stainless; 0.4, 0.6, 0.8 mm hardened steel |
| H2 / P2S / X2D Standard Flow ($21.99) | H2D, H2D Pro, H2S, H2C (left hotend), P2S, X2D | 350 °C | 0.2 mm stainless; 0.4, 0.6, 0.8 mm hardened steel |
| H2 / P2S / X2D High Flow ($52.99) | H2D, H2D Pro, H2S, H2C (left hotend), P2S, X2D | 350 °C | 0.4, 0.6, 0.8 mm hardened steel |
| E3D High Flow ObXidian (coming soon) | X1C, P1P, P1S | 300 °C | 0.4, 0.6 mm |
| Tungsten Carbide, Standard and High Flow (coming soon) | H2D (both hotends), H2S, H2C (left hotend), P2S, X2D | 350 °C | 0.4, 0.6, 0.8 mm |
| Vortek Induction Hotend (coming soon) | H2C (right hotend only) | 350 °C | 0.2, 0.4, 0.6, 0.8 mm; hardened or stainless |
Stock nozzles. Per Bambu, the P1S ships with a 0.4 mm stainless steel nozzle and the X1C with a 0.4 mm hardened steel nozzle. A P1S moved to carbon fiber needs a hardened hotend first. The P1/X1 hotends swap between the P1P, P1S and X1C. The X1E is a different case: Bambu lists dedicated X1E complete hotend assemblies, and the P1/X1 hotends above are not listed for it, so check before buying one for an X1E.
A Series is different. The A Series splits the nozzle from the heating assembly, so you can replace the nozzle ($14.99) without replacing the heater and thermistor ($29.99 for the heating assembly, listed for the A1 and A1 Mini). P1/X1 hotends are all-in-one units, sold as nozzle-only or as complete hotends with heater, thermistor, sock and fan.
Quick-swap hotend with a tool-steel bore, for people printing abrasive filament at volume. A P1P / P1S version is also available.
Coming soon: ObXidian, Tungsten Carbide and Vortek
Three more options appear in Bambu's own nozzle lineup. They are not in our catalog yet, and we are adding them. This is what Bambu says about each:
- E3D High Flow ObXidian (X1C, P1P, P1S). Developed jointly by Bambu Lab and E3D. It has an ObXidian hardened nozzle and an E3DLC coating, and Bambu states it provides about 60% more flow. It is the high-flow route for P1 and X1 printers, with official Bambu Studio presets for 0.4 and 0.6 mm.
- Tungsten Carbide (H2D, H2S, H2C left hotend, P2S, X2D). Standard and High Flow, 0.4, 0.6 and 0.8 mm, up to 350 °C. Bambu says it shows significantly less wear than hardened steel, even after many kilograms of abrasive filament. It is for people who burn through hardened nozzles.
- Vortek Induction Hotend (H2C right hotend). The H2C swaps right-side hotends automatically, with up to six installed for alternating use. Bambu says it heats to printing temperature in about 8 seconds and has no cables or connectors to wear out. Standard and High Flow, 0.2 to 0.8 mm.
Until they arrive, the in-stock options for faster P1 and X1 printing are the Mako above and the options covered in the High Flow guide.
The silicone sock
A silicone sock wraps the heater block. It insulates the block from the part cooling airflow, which helps hold a steady temperature, and filament blobs stick to silicone far less than to bare metal, so cleaning is easier and a blob is less likely to drag across the print. Socks are series-specific, so match yours to the printer, and replace one that is torn or brittle. We carry socks for the P1/X1, A1 Mini and H2D.
The extruder gear sees the same abrasive filament as the nozzle. Hardened steel lasts longer on CF and GF.
Which nozzle should you buy?
PLA, PETG, ABS, ASA or TPU only: your stock nozzle is the right one. Replace it when it wears or clogs for good.
Starting on CF or GF: buy the hardened steel hotend for your series before the first spool. 0.4 mm for Bambu's own PLA-CF and PETG-CF, 0.6 mm for the rest.
Large parts, shorter print times: go to 0.6 mm. You trade edge detail and small features for speed, which suits structural parts and enclosures.
Miniatures, fine text, jewelry: 0.2 mm, with dry filament and slower speeds. Both matter far more at this size.
CF at volume on a P1 or X1: a Mako covers flow and wear in one swap, at a higher price than a stock hardened hotend. The ObXidian covers the same ground once it is in the catalog.
FAQ
What nozzle does a P1S come with?
A 0.4 mm stainless steel hotend. The X1C comes with a 0.4 mm hardened steel one. To print CF, GF or glow filament on a P1S, buy a hardened steel hotend first.
Can I use a P1S hotend on an X1C?
Yes. P1P, P1S and X1C share the hotend mounting, and P1/X1 hotends swap between them.
Does a P1/X1 hotend fit an A1 or A1 Mini?
No. The A Series and P1/X1 hotends are different designs. Always buy the one labeled for your series.
Does Bambu PLA-CF need a hardened nozzle?
Yes. All CF filament needs hardened steel, including Bambu's own. Bambu approves its PLA-CF and PETG-CF for 0.4 mm hardened steel. Use 0.6 mm for third-party CF.
Do the P1/X1 hotends fit an X1E?
They are not listed for it. Bambu sells dedicated X1E hotend assemblies, so confirm the part number for your X1E before ordering.
How do I know my nozzle is worn?
Horizontal dimensions 0.1 to 0.3 mm oversize, rougher top surfaces, and under-extrusion at settings that used to work. A visibly oval tip confirms it. If you run CF through stainless, suspect the nozzle first.
Find the right hotend for your printer
Official Bambu Lab hotends for A Series, P1, X1, H2 Series, P2S and X2D.
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