If you’re buying your first serious 3D printer in 2026, chances are your shortlist has narrowed to two machines from the same company: the Bambu Lab A1 and the Bambu Lab P1S. It’s easily the most-asked question among new buyers in the Bambu community — and for good reason. Both printers share the same build volume, the same slicer, the same reputation for working out of the box, yet they take completely different approaches to how a printer should be built.
The A1 is an open-frame “bedslinger” aimed squarely at beginners, while the P1S is a fully enclosed CoreXY machine built for a wider range of materials. This guide walks through the differences that actually matter — motion system, enclosure, materials, multi-color printing, and known issues — so you can decide which one deserves your money first.
By the end, you’ll know exactly which printer fits your use case, and which “upgrade” arguments you can safely ignore.
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Table of Contents
- Quick verdict
- Step 1: Understand the core design difference
- Step 2: Compare the specs that are identical
- Step 3: Decide whether you need an enclosure
- Step 4: Factor in multi-color printing (AMS vs AMS Lite)
- Step 5: Weigh usability and maintenance
- Step 6: Check the known issues before you order
- Common mistakes and troubleshooting
- FAQ
- Conclusion
- Sources
Quick verdict
| Bambu Lab A1 | Bambu Lab P1S | |
|---|---|---|
| Design | Open-frame Cartesian (bedslinger) | Fully enclosed CoreXY |
| Build volume | 256 × 256 × 256 mm | 256 × 256 × 256 mm |
| Max hotend temp | 300 °C | 300 °C |
| Max speed | 500 mm/s | 500 mm/s |
| Acceleration | 10,000 mm/s² | 20,000 mm/s² |
| Best materials | PLA, PETG, TPU | PLA, PETG, TPU, ABS, ASA |
| Multi-color | AMS Lite (up to 4 colors) | AMS (up to 16 colors with 4 units) |
| Display | Full-color touchscreen | Basic LCD with buttons |
| Best for | Beginners, PLA-first hobbyists | Material versatility, long-term production |
Short answer: buy the A1 if you’re starting out and will mostly print PLA and PETG. Buy the P1S if you know you’ll want ABS/ASA, more colors, or a machine that scales with you.
Step 1: Understand the core design difference
Everything else in this comparison flows from one architectural choice.
- The A1 is a Cartesian “bedslinger.” The print bed moves back and forth on the Y axis while the toolhead moves on X. This keeps the machine simpler and cheaper to build, and makes the mechanics easy to see and access — but the whole bed (plus your print) is constantly in motion, and the design needs extra desk depth because the bed protrudes front and back during printing.
- The P1S is a CoreXY machine. The bed only moves down slowly as the print grows; all fast movement happens in the lightweight toolhead. This is why the P1S is rated at double the acceleration (20,000 mm/s² vs 10,000 mm/s²), and why tall prints are less affected by bed shake.
- The P1S is enclosed; the A1 is open. The P1S’s closed chamber holds heat around the print, which matters enormously for warp-prone materials (more in Step 3). The A1’s open frame means easier cleaning and repairs, but no draft protection.
In practice, independent testing notes that real-world speed differences between the two are smaller than the acceleration numbers suggest — both are genuinely fast printers by 2026 standards.
Step 2: Compare the specs that are identical
Don’t overthink these — they’re effectively a tie:
- Build volume: both print up to 256 × 256 × 256 mm.
- Hotend: both ship with all-metal hotends that reach 300 °C, enough for PLA, PETG, TPU and engineering blends.
- Top speed: both are rated to 500 mm/s.
- Auto bed leveling: both use strain-sensor-based automatic leveling and run self-calibration routines before printing — no manual paper-under-the-nozzle ritual on either machine.
- Camera: both include a basic low-framerate camera for remote monitoring and timelapses via the Bambu Handy app.
- Slicer and ecosystem: both run Bambu Studio, both connect to MakerWorld’s model library, and both print from the same profiles.
If your decision hinged on print quality alone, forum users consistently report the difference is slight — barely noticeable on typical prints.
Step 3: Decide whether you need an enclosure
This is the single biggest practical difference.
- List the materials you realistically expect to print in the next 12 months. Be honest — most beginners print PLA for a year before touching anything exotic.
- If your list is PLA, PETG and TPU: the open-frame A1 handles all of them well. These materials don’t need a heated chamber, and PLA actually prefers open airflow.
- If ABS or ASA is on the list: you want the P1S. These materials shrink as they cool, and drafts cause warping and layer splitting. The P1S’s enclosure holds chamber heat, and its activated-carbon air filtration helps manage the styrene odor ABS produces. Users on Bambu’s own forum consistently report the enclosure is what makes ABS reliable rather than a gamble.
- Consider your room, too. If your printer will live somewhere with drafts, dust, or curious pets, the enclosure earns its keep even for PETG.
An enclosure can be added to an A1 later via third-party solutions, but it’s a compromise compared to a machine designed around one.
Step 4: Factor in multi-color printing (AMS vs AMS Lite)
Both printers support Bambu’s automatic material system, but not the same one.
- A1 + AMS Lite: up to 4 colors/materials. The AMS Lite is an open spool holder unit — users report jams are easier to see and clear, but it takes up noticeable side space and doesn’t protect filament from humidity.
- P1S + AMS: up to 4 colors per unit, and you can chain up to 4 AMS units for a maximum of 16 colors. The enclosed AMS also acts as a semi-sealed dry box for your filament.
- Decide how much multi-color actually matters to you. Multi-color printing is fun but slow and wasteful (purge waste per color change). If you mostly print functional single-color parts, don’t let the 16-color headline sway you.
Step 5: Weigh usability and maintenance
- Interface: the A1 has a full-color touchscreen; the P1S makes do with a small monochrome LCD driven by buttons. Day to day, most control happens from Bambu Studio or the phone app anyway, but the A1’s screen is genuinely nicer for on-device operations.
- Calibration intelligence: the A1 includes a flow-rate sensor in the hotend and performs active flow-rate compensation automatically — forum users highlight this as the reason the A1 is more forgiving for novices, while the P1S expects you to run manual flow calibration for new filaments.
- Nozzle swaps: the A1’s quick-swap nozzle design makes changing nozzles a tool-light job; the P1S hotend swap is more involved.
- Access: the A1’s open frame makes cleaning and repairs simpler. The P1S requires working inside an enclosure.
- Footprint: remember the A1 needs front-to-back clearance for the moving bed, plus side space if you add the AMS Lite. The P1S with AMS on top is taller but more compact on the desk.
Step 6: Check the known issues before you order
No printer is flawless. Know these going in:
- A1 heatbed cable recall (early units): Bambu Lab recalled early A1 units sold before January 30, 2024, after reports of heatbed cable damage that could cause short circuits — the company offered free replacement heatbeds and cables. Units sold since use the revised part, but if you ever buy a used early A1, verify the recall replacement was done (affected serials have “A” as the sixth digit).
- Bedslinger physics: users report tall, thin prints on the A1 can show more ringing or wobble artifacts than on the P1S, simply because the print rides on a fast-moving bed.
- P1S display frustration: the dated LCD is the most common P1S complaint in community threads — plan to drive it from the app or slicer.
- AMS Lite humidity exposure: because the AMS Lite is open, users in humid climates report needing separate filament drying more often than P1S+AMS owners.
Common mistakes and troubleshooting
- Buying the P1S “just in case” and never printing ABS. Users report this is the most common regret path in reverse — if you’re not sure you need an enclosure, the money is often better spent on the A1 plus filament.
- Placing the A1 on its heatbed cable during setup. Bambu identified stress on the cable root as a damage cause during the recall investigation; route the cable freely and never rest the printer on it.
- Ignoring desk depth for the A1. Measure for the bed’s full travel before choosing a shelf — the bed swings beyond the printer’s footprint.
- Expecting the A1’s 4-color AMS Lite to behave like a dry box. It doesn’t seal; users report storing hygroscopic filaments (TPU, PETG) in dryers between prints.
- Printing ABS on the A1 in a drafty room. Users report warping and split layers; if ABS is a must, that’s the P1S’s job.
FAQ
Is the P1S worth the extra cost over the A1? Only if you’ll use what the extra money buys: the enclosure (ABS/ASA capability), higher acceleration, and 16-color AMS expansion. For a PLA/PETG hobbyist, the A1 delivers nearly identical print quality for less. Check the current price of both before deciding — the gap shifts with promotions.
Can the Bambu Lab A1 print ABS? Technically the 300 °C hotend can melt it, but the open frame makes warping likely on anything beyond small parts. Bambu positions ABS/ASA as P1S-and-up territory, and user reports agree.
Do the A1 and P1S have the same build volume? Yes — both print up to 256 × 256 × 256 mm.
Which is better for a complete beginner? The A1. Its automatic flow-rate calibration, touchscreen, and quick-swap nozzle make it the most forgiving machine in Bambu’s lineup, per consistent community feedback.
Was the A1 recall fixed? Bambu Lab issued free replacement heatbeds and cables for affected early units (sold before January 30, 2024) and revised the part in later production. New units ship with the updated design.
Conclusion
The honest recommendation: most first-time buyers should get the A1. It matches the P1S on build volume, hotend temperature, and rated speed, adds a better screen and smarter auto-calibration, and costs meaningfully less — money that’s better spent on filament while you learn.
Choose the P1S instead if any of these are true: you already know you need ABS or ASA parts, you want the enclosed AMS ecosystem with up to 16 colors, or the printer will run long production jobs where CoreXY stability pays off.
Either way, you’re buying into the same slicer, the same app, and the same ecosystem — so there’s no wrong door, just a wrong order.
👉 Check current availability and pricing for the Bambu Lab A1 and P1S here: Sources
