Nozzles & Plates
Do I need a hardened nozzle for this filament?
One rule covers every case: does the filament contain something harder than the nozzle? Here is the answer per material.
By Michael W. · Published October 5, 2026
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The one rule
You need a hardened nozzle if the filament contains a filler harder than steel. That is it. The base polymer is irrelevant — plain PETG needs nothing, PETG-CF needs hardened steel, and they are the same polymer.
Fillers that require it: carbon fiber, glass fiber, metal powder, wood particles, mineral or stone filler, glitter (which is glass), and glow pigment (strontium aluminate, which is genuinely hard).
Materials that do not: PLA, PETG, ABS, ASA, PC, nylon and TPU, as long as they are unfilled.
Every filament, answered
| Filament | Hardened nozzle? | Notes |
|---|---|---|
| PLA | No | Not abrasive. Stainless lasts years. |
| PETG | No | Not abrasive, despite being stickier to print. |
| PETG-HF | No | High-flow variant of the same polymer; no filler. |
| ABS | No | Not abrasive. Needs a chamber, not a nozzle. |
| ASA | No | Same as ABS. |
| TPU (unfilled) | No | Soft and not abrasive. Its problems are feeding, not wear. |
| Polycarbonate (unfilled) | No | Needs high temperature and dryness, not hardness. |
| Nylon (unfilled) | No | Needs drying far more than it needs a hard nozzle. |
| PLA-CF | YES | Chopped carbon fiber. Use 0.6 mm as well. |
| PETG-CF | YES | Same filler, same answer. |
| PA-CF / PA6-CF / PA12-CF | YES | Carbon-filled nylon. 0.6 mm and dry it. |
| Any -GF (glass-filled) | YES | Glass is harder than the nozzle. |
| Metal-filled PLA | YES | Metal particles abrade directly. |
| Wood-filled PLA | YES | Wood particles plus binder: abrasive and clog-prone. |
| Marble / stone-effect PLA | YES | Mineral filler. |
| Silk PLA (plain) | No | Plain silk has no abrasive filler. |
| Silk PLA with glitter | YES | The glitter is glass. |
| Glow-in-the-dark | YES | Strontium aluminate pigment. The surprise entry on this list. |
The three that catch people out
Glow-in-the-dark
It looks like ordinary PLA and it is loaded with strontium aluminate, which is hard enough to round a stainless nozzle quickly. People print a glow project, then notice their lines have gone wide on every subsequent print and spend a week blaming the slicer. If you buy glow filament, buy a hardened nozzle in the same order.
Glitter and some silks
The sparkle is glass particles. Plain silk PLA is fine; anything visibly glittery is not. If the filament description mentions sparkle, shimmer or glitter, treat it as abrasive.
Wood-filled
Less abrasive than carbon fiber but still abrasive, and much more clog-prone because the particles are large and irregular. Hardened steel plus a 0.6 mm nozzle is the comfortable combination, and the bore size is doing more of the work than the hardness.
How bad is it if you already did it?
It depends entirely on how much. One short print in glow PLA through a stainless nozzle is probably survivable. A kilogram of PLA-CF is not — that nozzle is finished.
The symptom of a worn nozzle is uniformly poor quality: lines wider than the slicer intended, soft detail everywhere at once, dimensional accuracy drifting. That is distinct from intermittent faults, which are clogs or feed problems. How to tell a worn nozzle.
What a hardened nozzle does not fix
Worth stating because people buy one expecting more than wear resistance:
- It does not stop clogs. Clogs come from moisture, heat creep and debris. A hardened nozzle clogs exactly as readily as a stainless one. Clog procedure.
- It does not make the printer faster. Bore diameter does that, and slightly lower thermal conductivity works marginally against it.
- It does not improve PLA. Same geometry, same output.
- It does not let an open machine print ABS. That is a chamber question — how to print ABS.
Where to go next
Which hardened nozzle to buy for your machine. Nozzle sizes for the diameter question. Filament compatibility for what each printer can run at all, which is a different and equally common question.
What to buy
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1. The answer for most filled filament
Bambu Lab Hotend with Hardened Steel Nozzle, 0.4 mm
HRA 74 hardened steel in the diameter you already run, so profiles stay valid.
If the table below says yes for the filament you want to print, this is the purchase. A complete hotend assembly with a 0.4 mm hardened steel nozzle for the P1P and P1S, which keeps all your existing print profiles valid.
Fit it before the first spool, not after. The damage abrasive filler does to a stainless nozzle is cumulative and not reversible.
What it gets right
- Abrasive filament rounds a stainless nozzle fast — with the worst materials, a single print can do it
- Comes as a complete assembly, so the swap is a module change rather than a nozzle extraction
- 0.4 mm keeps your existing print profiles valid
What it does not
- Hardened steel conducts heat slightly worse than stainless, so very high-flow PLA needs a small temperature bump
- Pointless if you only ever print plain PLA and PETG — stainless lasts for years on those
- P1P and P1S only; the A-series and H-series need their own part
| Nozzle | Hardened steel, 0.4 mm |
|---|---|
| Fits | P1P and P1S (model FAH001-N-1) |
| Hardness reference | Hardened steel is cited at HRA 74 |
| Supplied as | Complete hotend assembly |
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2. The answer for carbon fiber specifically
Bambu Lab Hotend with Hardened Steel Nozzle, 0.6 mm
Hardened steel plus a wider bore, because CF clogs 0.4 mm regardless of material.
Carbon fiber is the one case where diameter matters as much as hardness. Chopped fiber lengths bridge a 0.4 mm bore and block it, so 0.6 mm is the standard choice for CF filament regardless of nozzle material.
Supplied as a complete assembly for the P1P and P1S, same as the 0.4 mm version.
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 |
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3. The answer if you own an A-series machine
BIQU Panda Juicer Hotend
0.4 mm hardened steel for an A1, A1 mini or H2D, since P-series parts will not fit.
A-series hotends are a different catalog from P-series ones, and this is the straightforward hardened option for an A1, A1 mini or H2D at 0.4 mm.
Standard flow rather than high flow, so existing profiles stay close to right. Cheap enough to keep a spare, which is the real answer to a clog.
What it gets right
- Hardened steel at 0.4 mm covers abrasive filament on the A-series, which the stock stainless nozzle does not
- Cheap enough to keep a spare on the shelf, which is the actual answer to a clog at 2 a.m.
- Standard flow means your existing profiles stay close to right
What it does not
- Standard flow, so it is not a speed upgrade — do not buy it expecting one
- A third-party hotend on a machine under warranty is a decision, not a free lunch
- A-series and H2D fitment only; it will not fit a P1S
| Nozzle | 0.4 mm hardened steel |
|---|---|
| Fits | Bambu Lab A1, A1 mini and H2D |
| Positioning | Standard flow, for daily printing and maintenance |
Questions people actually ask
Do I need a hardened nozzle for PETG?
No. PETG is not abrasive and a stainless nozzle handles it for years. PETG-CF is a different matter - the carbon fiber filler requires hardened steel, even though the base polymer is identical.
Do I need a hardened nozzle for ABS or ASA?
No. Neither is abrasive. What those materials need is a warm chamber, low part cooling and dry filament - the nozzle is not the limiting factor.
Do I need a hardened nozzle for glow-in-the-dark filament?
Yes, and it is the answer people least expect. Glow filament contains strontium aluminate pigment, which is hard enough to round a stainless nozzle quickly. Buy the nozzle in the same order as the filament.
Do I need a hardened nozzle for TPU?
Not for unfilled TPU, which is soft and not abrasive - its problems are feeding and adhesion rather than wear. Any TPU with carbon fiber or glass in it needs hardened steel like every other filled material.
What nozzle do I need for carbon fiber filament?
Hardened steel in 0.6 mm. The hardness handles the abrasion and the wider bore handles the clogging, because chopped fiber lengths bridge a 0.4 mm orifice. Expect to re-slice your profiles for the larger nozzle.
Will a hardened nozzle stop my prints clogging?
No. Clogs come from moisture, heat creep and debris from previous materials, and a hardened nozzle clogs exactly as readily as a stainless one. The hardness only addresses wear.
Sources
- Bambu Lab hardened steel nozzle and hotend upgrade for the P1S - Bambu Lab wiki
- Hardened steel (HRA 74) and tungsten carbide (HRA 90) hardness figures, and H2C automatic hotend swapping - third-party lineup roundups captured October 2026
- BIQU Panda hotends, plates and fitment lists - OpenELAB upgrade guide
Read this next
- The Bambu Lab hardened steel nozzleWhat hardened steel at HRA 74 is for, which filaments require it, and why the complete-assembly format matters for fitting it.
- Hardened steel vs stainless steel nozzlesHardened steel at HRA 74 versus stainless versus carbide at HRA 90 - which material your filament requires, and what each costs you.
- Bambu Lab nozzle sizes explainedWhat 0.2, 0.4, 0.6 and 0.8 mm nozzles are each for, what changing costs in re-slicing, and why friction stops most people switching.
- Clearing a clogged nozzleThe procedure for clearing a clog, plus the four causes behind it - because clearing without diagnosing gets you a repeat.
- Which filaments your Bambu Lab can actually printA per-machine compatibility table, the three things that actually gate material choice, and which of them you can buy your way past.
- 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.