Bambu Lab A1 vs P1S: Open vs Enclosed — Which Is Better?
Detailed Bambu Lab A1 vs P1S comparison: speed, print quality, noise, materials, and price. Full spec table and verdict on Printer Hub.
The Bambu Lab A1 and Bambu Lab P1S are two of the most popular printers in Bambu's lineup, but they take fundamentally different approaches. One is an open-frame bedslinger at a budget-friendly price. The other is an enclosed CoreXY with a carbon filter. Both share the same 256 x 256 x 256 mm build volume and 500 mm/s top speed. So what's the real difference, and which one should you buy?
TL;DR
A1 — if you mostly print PLA/PETG and want to save money. P1S — if you need an enclosure for ABS/ASA/nylon, want 2x the acceleration, and prefer quieter operation. When the P1S goes on sale at $399 (same as the A1's list price), it's a no-brainer.
Specs Comparison
| Spec | Bambu Lab A1 | Bambu Lab P1S |
|---|---|---|
| Motion System | Bedslinger (Cartesian) | CoreXY |
| Build Volume | 256 x 256 x 256 mm | 256 x 256 x 256 mm |
| Max Speed | 500 mm/s | 500 mm/s |
| Max Acceleration | 10,000 mm/s² | 20,000 mm/s² |
| Max Flow Rate | 28 mm³/s | 32 mm³/s |
| Enclosure | Open frame | Fully enclosed with carbon filter |
| Max Nozzle Temp | 300°C | 300°C |
| Max Bed Temp | 100°C | 110°C |
| Extruder | Direct drive, all-metal | Direct drive, all-metal |
| Multi-color | AMS Lite (1 unit, 4 colors) | AMS / AMS 2 Pro (up to 4 units, 16 colors) |
| Camera | Optional (USB-C) | 720p built-in |
| Display | Color touchscreen | Monochrome LCD (buttons) |
| Weight | 8.3 kg (18.3 lbs) | 12.95 kg (28.5 lbs) |
| Price (MSRP) | ~$399 | ~$699 |
| Price (sale) | from $299 | from $399 |
Build Quality & Design
The A1 is a bedslinger: the bed moves on the Y axis while the printhead travels on X and Z. It's a lighter, simpler design, but the bed swinging back and forth means you need roughly double the printer's depth in desk space. On the upside, the open frame gives you full access to the print from every angle — great for observation and maintenance.
The P1S runs a CoreXY motion system: the bed only moves on Z while the printhead handles X and Y. This allows for double the acceleration (20,000 vs 10,000 mm/s²) since it doesn't need to sling a heavy bed with your part on it. The full enclosure with a carbon filter lets you safely print ABS and ASA indoors, and the static footprint means it takes up exactly as much space as its dimensions suggest.
Both share steel frames with aluminum extrusions and an all-metal direct drive extruder with a hardened steel drive gear. Build quality is excellent on both — Bambu Lab delivers consistent manufacturing.
Print Quality
On PLA and PETG, print quality is virtually identical. Multiple reviews and community tests confirm that with the same Bambu Studio settings, you'd be hard-pressed to tell prints apart. Both handle Benchys, bridges, and overhangs with ease.
One interesting note from the community: the A1 reportedly produces slightly sharper embossed details and less stringing on fine geometry. The difference is subtle and only noticeable in direct side-by-side comparisons.
The real gap shows up on engineering materials. ABS, ASA, polycarbonate, and nylon need consistent chamber temperatures — without an enclosure, parts warp, crack, and delaminate. The P1S wins here, no contest.
Speed
Both printers top out at 500 mm/s, but that's only half the story. Real-world speed depends on acceleration — how fast the printhead can speed up and slow down between direction changes. The P1S has twice the acceleration at 20,000 mm/s² vs 10,000 mm/s². In practice, the P1S is noticeably faster on models with lots of fine detail. On large, simple prints (vases, boxes), the difference is minimal.
Max volumetric flow also differs: 32 mm³/s on the P1S vs 28 mm³/s on the A1. When printing with larger nozzles (0.6-0.8 mm) or higher layer heights, the P1S can push more plastic through.
Noise
The P1S is quieter — the enclosure acts as built-in sound dampening. Both claim ~48 dB in silent mode, but the A1 is subjectively louder thanks to its open frame. The bed swinging back and forth creates additional vibrations that transfer to your desk.
Forum users report the A1 can hit up to 72 dB at full speed — about as loud as a conversation. The P1S at the same speeds is noticeably quieter. If the printer will live in your bedroom or living room, the P1S is the better roommate.
Software & Ecosystem
Almost no difference here. Both use Bambu Studio (or OrcaSlicer) with ready-made profiles, can be controlled via Bambu Handy on your phone, and connect to Bambu's cloud.
The key difference is multi-color. The A1 supports only one AMS Lite with 4 spools — up to 4 colors. The P1S works with the classic AMS and AMS 2 Pro — up to 4 units for 16 colors total. If you're serious about multicolor printing, the P1S is the only option.
Another difference — the display. The A1 has a color touchscreen with model previews, while the P1S has a monochrome LCD with physical buttons. Day to day, the A1's screen is more pleasant, though most people control the printer via the app.
Pricing & Value
At MSRP, the A1 costs $399 and the P1S $699 — a $300 gap. But Bambu Lab runs regular sales: the A1 drops to $299 and the P1S to $399. At the same $399 price point, the P1S is the obvious pick — you get an enclosure, doubled acceleration, and engineering material support for free.
AMS bundles tell a different story: the A1 + AMS Lite runs about $559, while the P1S + AMS 2 Pro + Hub is around $1,148. If multicolor is a must, the price gap widens significantly.
Verdict: Who Should Buy Which
Get the A1 if budget is tight and you're mainly printing PLA and PETG. It's a fantastic choice for hobbyists making decorative prints, toys, and prototypes. The A1 is lighter (8.3 kg), the AMS Lite is easier to service, and the open design makes it perfect for classrooms and makerspaces.
Get the P1S if you plan to work with ABS, ASA, nylon, or polycarbonate. An enclosure isn't a luxury — it's a necessity for engineering materials. The P1S is also faster on complex geometry, runs quieter, and has a predictable footprint. If you're printing functional parts, mechanisms, or replacements, the P1S justifies the price difference.
Bottom line: if you spot the P1S on sale at $399 — don't think twice. For the same price as the A1's MSRP, you get an enclosed CoreXY with a camera and doubled acceleration.