Nozzles & Plates
Bambu Lab nozzle sizes explained
0.4 mm is the right default and most people should stay there. The two reasons to change are specific, and both come with a bill.
By Michael W. · Published October 5, 2026
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What each size is for
| Size | Use it for | Costs you |
|---|---|---|
| 0.2 mm | Miniatures, fine mechanical detail, small text | Print times multiply; clog risk rises sharply |
| 0.4 mm | Everything else — the correct default | Nothing. This is the baseline. |
| 0.6 mm | Functional parts, carbon fiber, speed | Visibly coarser layer lines; all profiles need re-slicing |
| 0.8 mm | Large structural parts, vases, draft prints | Detail is gone; only suitable for a narrow class of print |
Why 0.4 mm is the default and should usually stay that way
Because it is the compromise every profile and every published setting assumes. Filament profiles, flow calibrations, slicer defaults and nearly all community advice are written around 0.4 mm. Moving away from it means you are now the person responsible for all of those decisions.
It is also genuinely a good compromise: fine enough for most detail, fast enough for most functional work, large enough not to clog readily. If you are not hitting a specific limit, there is nothing to gain.
When 0.6 mm is genuinely the right answer
Carbon fiber filament
The clearest case, and it is a clog fix rather than a speed choice. Chopped carbon fibers have length, and those lengths bridge a 0.4 mm orifice and block it. A wider bore passes them. Hardened steel plus 0.6 mm is the standard CF combination, and the bore is doing more work than the material.
Functional parts where finish does not matter
Brackets, jigs, mounts, tool holders. A 0.6 mm nozzle lays down thicker extrusions, which means fewer perimeters for the same wall thickness and faster prints with stronger walls. If your output is mostly functional, this is a real throughput gain.
When 0.2 mm is worth the pain
Miniatures, and genuinely fine mechanical detail like small threads or thin engraved text. Nothing else justifies it, because the costs are steep: print times multiply, and a smaller orifice blocks far more easily — a particle that passes a 0.4 mm nozzle without incident stops a 0.2 mm one.
Dry filament matters much more at this size. Moisture-driven clogging that is survivable at 0.4 mm is routine at 0.2 mm. Clog causes.
What changing diameter actually costs
- Every profile has to be re-sliced. Layer heights, line widths, flow and speeds all key off nozzle diameter. A 0.4 mm profile sent to a 0.6 mm nozzle gives you poor results that look like a hardware fault.
- Flow calibration should be re-run. Different nozzle, different flow behavior.
- Support interface quality changes. Coarser nozzles leave rougher support marks.
- Your reference points stop applying. Published settings and community advice assume 0.4 mm.
Where to go next
Which nozzle to buy for your machine and filament. Hardened or not, which is a separate question from diameter. How long a nozzle lasts if yours is behaving oddly.
What to buy
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1. What makes multiple sizes practical
BIQU Panda Revo Hotend
Quick nozzle changes, which is the only thing that turns owning two diameters into using two.
The reason most owners never use a second nozzle size is not cost, it is friction. On a stock P1S, changing diameter means changing the hotend, and that is enough to stop it happening.
The E3D Revo system changes nozzles by hand in seconds, on the P1S, P1P and X1C. That converts nozzle diameter from a maintenance decision to a per-print one, which is the entire point of this page.
What it gets right
- Revo nozzles change by hand in seconds — this is the single feature people buy a P2S for
- High-flow geometry is a genuine throughput gain on large single-color prints
- Turns nozzle diameter into a per-print choice instead of a maintenance decision
What it does not
- You are now off the official hotend, so a Bambu support conversation gets harder
- Revo nozzles cost more per nozzle than Bambu's own
- Flow calibration has to be redone; do not expect your old profiles to be exactly right
| System | E3D Revo quick-change nozzle |
|---|---|
| Fits | Bambu Lab P1S, P1P and X1C |
| Positioning | High-flow, high-speed |
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2. The second size worth owning
Bambu Lab Hotend with Hardened Steel Nozzle, 0.6 mm
0.6 mm hardened steel - faster functional parts, and the fix for carbon-fiber clogging.
If you are going to own one additional diameter, 0.6 mm is the one. It is meaningfully faster on functional parts, it produces stronger walls, and it is the standard answer for carbon-fiber filament where chopped fibers bridge a smaller bore.
Supplied as a complete hotend assembly for the P1P and P1S. Every profile needs re-slicing.
What it gets right
- The larger bore is the real fix for carbon-fiber clogging, not just a faster nozzle
- Hardened steel plus 0.6 mm is the combination for chopped-fiber filament
- Noticeably faster on functional parts where layer lines do not matter
What it does not
- Every profile has to be re-sliced; a 0.6 mm nozzle is not a drop-in for 0.4 mm settings
- Visible layer lines and softer detail on anything decorative
- You will end up wanting both sizes, which is the argument for a quick-swap machine
| Nozzle | Hardened steel, 0.6 mm |
|---|---|
| Fits | P1P and P1S |
| Supplied as | Complete hotend assembly |
Questions people actually ask
What nozzle size should I use on a Bambu Lab printer?
0.4 mm, unless you have a specific reason to change. Every filament profile, flow calibration and piece of community advice assumes it, and it is a genuinely good compromise between detail and speed. Change to 0.6 mm for carbon fiber or fast functional parts, and to 0.2 mm only for miniatures.
What size nozzle for carbon fiber filament?
0.6 mm, in hardened steel. Chopped carbon fibers have length and those lengths bridge a 0.4 mm orifice and block it, so the wider bore is the real fix. The hardened material handles the abrasion separately.
Does a bigger nozzle print faster?
Yes, meaningfully, because thicker extrusions mean fewer perimeters and fewer layers for the same part. The trade is visibly coarser layer lines and softer fine detail, which is why it suits functional parts rather than decorative ones.
Can I use a 0.4 mm profile with a 0.6 mm nozzle?
No - layer heights, line widths, flow rates and speeds all key off nozzle diameter. Running the wrong profile gives you poor results that look convincingly like a hardware fault. Re-slice everything and re-run flow calibration after changing diameter.
Is a 0.2 mm nozzle worth it?
Only for miniatures and genuinely fine mechanical detail. Print times multiply and clog risk rises sharply, because a particle that passes a 0.4 mm nozzle without incident will stop a 0.2 mm one. Dry filament matters much more at this size.
Sources
- Bambu Lab hardened steel nozzle and hotend upgrade for the P1S - Bambu Lab wiki
- BIQU Panda hotends, plates and fitment lists - OpenELAB upgrade guide
- Hardened steel (HRA 74) and tungsten carbide (HRA 90) hardness figures, and H2C automatic hotend swapping - third-party lineup roundups captured October 2026
Read this next
- The best nozzles and hotends for a Bambu LabHardened steel, quick-change or a second diameter - which nozzle upgrade matches your filament and your machine, with who each is wrong for.
- Do I need a hardened nozzle for this filament?The one rule that answers this for every filament, plus a per-material table covering PETG, ABS, CF, silk, wood, marble and glow.
- How long a nozzle lasts, and how to tell when it is doneThe difference between a worn nozzle and a clogged one, what actually wears a nozzle, and when to replace rather than clean.
- Bambu Lab P1S vs P2SThe P2S adds a touchscreen and a quick-swap nozzle and no build volume. When that is worth a new machine and when a far cheaper part does the same job.
- Bambu Lab H2CWhy automatic hotend swapping changes how you print rather than just how fast, and why it is still the wrong machine for most owners.