The A1 is the open-frame version of Bambu’s lineup — same 256mm build cube and calibration ecosystem as the enclosed P1S, without the chamber. For users printing PLA, PETG, and TPU who don’t need ABS/ASA, it’s the most cost-effective way to get into Bambu’s automatic calibration system. The printer that most directly challenged the Prusa MK4S when it launched.
What It Does Well
The 256×256×256mm cube is the same as the P1S. Build volume isn’t sacrificed for the lower price — the A1 handles the same size prints as Bambu’s enclosed machines.
Bambu’s calibration stack (vibration compensation, flow calibration, bed leveling) runs before each print. First layer consistency is high enough that most users never touch Z-offset manually. For users who’ve spent hours manually calibrating cheaper printers, this is genuinely valuable.
AMS Lite compatible. The A1 Combo bundles the AMS Lite; the solo A1 can add it separately for $199. This gives a path to 4-color printing if priorities change.
At 500mm/s with input shaping, PLA prints run substantially faster than comparable bedslingers. A part that takes 4 hours on an Ender 3 typically completes in 2 hours on the A1 at equivalent quality settings.
Where It Falls Short
No enclosure means ABS and ASA are impractical for parts larger than roughly 80mm in any warping-prone axis. The bed reaches 100°C (sufficient for first layer adhesion on ABS) but the open frame creates temperature gradients that cause layer separation on tall parts.
The A1 uses a moving-bed Cartesian design in the Y axis — the same fundamental architecture as the Ender 3 series. At high speeds, tall and narrow prints can experience issues from bed inertia. Parts under 200mm tall are fine; extreme aspect-ratio prints (very tall, very narrow) may wobble at 500mm/s.
Materials
PLA and PLA+: 215–220°C, 60°C bed. Use Bambu Studio’s default PLA profile — it’s well-tuned for this machine. Enable vibration compensation on the first print; it calibrates once and stores the result.
PETG: 240–245°C, 70–75°C bed, fan 40%. PETG bonds strongly to PEI — use a light PVA glue layer if parts are difficult to remove after the bed cools.
TPU (95A): Load directly (bypass AMS Lite for reliability). 220°C, 25–30mm/s, retraction 0.5mm. The direct drive handles flex without buckling.
PVA (support material): Compatible with AMS Lite for dual-material support structures with PLA. PVA dissolves in water — useful for complex PLA prints with internal channels. Requires the A1 Combo or separately added AMS Lite.
vs. the Competition
Bambu P1S ($699): Enclosed, handles ABS/ASA/Nylon, higher bed temp (110°C), $300 more. If engineering materials are on the roadmap, P1S is the right choice. If you’re printing PLA/PETG only, the A1 saves $300 for identical build volume and calibration.
Prusa MK4S ($799): Slower (200mm/s), smaller bed (250×210mm), more expensive, but backed by Prusa’s documentation, repair parts availability, and community. If long-term reliability and repairability matter more than speed, MK4S.
Anycubic Kobra 3 ($299): CoreXY motion (vs. A1’s Cartesian Y axis), 250mm bed, $100 less. The Bambu ecosystem is more polished; the Kobra 3 saves money for comparable PLA results.