P1S hardware decision

Does the Bambu Lab P1S need a hardened nozzle?

For ordinary non-abrasive filament, not automatically. For carbon- or glass-fiber reinforced filament, Bambu Lab says the stock P1S should be upgraded before direct printing. The nozzle is only one part of that wear path.

Official Bambu Lab sources checked 24 July 2026No affiliate links

Short answerFor CF/GF composites, plan a hotend and extruder upgrade—not just a nozzle swap.

The P1S quick-start specification lists a stainless steel nozzle and steel extruder gears. It calls PA and PC capable, but labels carbon- and glass-fiber reinforced polymers “not recommended.” Bambu's P1 guidance says reinforced filament should not be printed directly before upgrading both the extruder and hotend.

The distinction that matters

PA is not the same hardware decision as PA-CF

Non-abrasive

PLA / PETG / ABS / ASA

Stock hardware category

These materials do not create the same abrasive-wear requirement as fiber-filled composites. Exact filament guidance still controls.

Engineering, unfilled

PA / PC

Capable, with conditions

The P1S specification calls these material families capable. Drying, enclosure, formulation, and profile requirements remain significant.

Abrasive

Bambu PLA-CF / PETG-CF

Hardened 0.4 mm supported

Bambu's hotend guidance says its own PLA-CF and PETG-CF can use a 0.4 mm hardened-steel nozzle.

Abrasive + clog risk

Third-party CF / GF

Hardened 0.6 mm highly recommended

Bambu recommends the larger hardened nozzle for many third-party fiber-filled filaments to reduce abrasion and clogging risk.

Do not transfer the unfilled PA/PC claim to PA-CF or PC-CF. The filler changes wear and flow behavior even when the base polymer name looks familiar.

Stock P1S versus reinforced filament

Why a hardened nozzle alone is an incomplete answer

Stock hotend

Stainless steel nozzle

The quick-start specification identifies stainless steel as the standard P1S nozzle material.

Stock feed path

Steel extruder gears

Bambu separately tells P1 users to upgrade the extruder before fiber-reinforced materials.

Reinforced-material path

Hardened hotend + hardened extruder

Treat both as part of the abrasive-wear upgrade, then choose nozzle size from the exact filament guidance.

Before ordering parts

Run the decision in this order

01
Read the exact filament data sheet.
Confirm whether the filament is actually fiber-filled, its recommended nozzle material and diameter, drying cycle, and printing temperatures.
02
Separate wear resistance from clog resistance.
Hardened steel addresses abrasion. A larger orifice may reduce fiber-related clogging, but the maker's stated diameter still wins.
03
Upgrade the complete abrasive path.
For the P1S, follow Bambu's hotend and extruder guidance rather than assuming one replaceable component makes the system reinforced-material ready.
04
Check everything beyond wear.
Nozzle and bed temperatures, drying, chamber conditions, ventilation, build surface, and part geometry can still make the pairing unsuitable.

Primary source trail

Documents used for this decision

01P1S Quick Start GuideHardware + materials PDF &nearr;02Bambu Lab P1 series guidanceUpgrade warning &nearr;03Bambu hotend for P1 seriesNozzle-size guidance &nearr;04Bambu P1 comparisonStock specification &nearr;

Hardware compatibility does not establish safe printing conditions.

Follow the exact filament and printer instructions for ventilation, emissions, drying, temperatures, build surface, and maintenance. Modification can change support or warranty conditions.