I spent weeks fighting my Bambu's AMS, and now I understand why it's worth the frustration

At a glance:

• The original Bambu Lab AMS can cause feeding, retraction and spool‑roll issues that halt prints.
• The newer AMS 2 Pro adds active drying, airtight storage and a faster motor, reducing many of the original pain points.
• Bambu Lab P1S specs: 256 × 256 × 256 mm build volume, up to 500 mm/s print speed, supports PLA, PETG, TPU, PVA, PET, ABS, ASA.

Why the AMS feels like a double‑edged sword

Jeff, a veteran IT support specialist turned tech writer, describes the AMS (Automatic Material System) as the most frustrating component of his Bambu Lab P1S Combo. While the printer itself is described as “boringly reliable,” the AMS introduces a layer of complexity that can turn a smooth print into a stalled job. Issues range from a spool refusing to feed, to filament path quirks, to retraction errors that appear even when the slicer settings, bed adhesion and filament dryness are perfect. Because these problems surface after the printer has already demonstrated it can handle the job, they feel especially aggravating.

The AMS essentially acts as a filament manager rather than a simple color‑changing accessory. It adds sensors, moving parts, tubes and firmware logic, creating new failure points that do not exist on a standalone Bambu printer. When the system works, it feels like a ready‑to‑go workstation; when it fails, it becomes the bottleneck that slows the entire workflow.

Convenience versus maintenance tax

When the AMS functions as intended, the convenience is tangible. Multiple spools are loaded and ready, eliminating the need to dig through storage, unload a filament, load a new one, and babysit each swap. This speeds up the start of a new project and encourages experimentation with different colors or materials. However, not all spools behave equally. Cardboard cores, uneven weight distribution, or low‑quality rolls can wobble, slip, or feed poorly, turning spool geometry into a critical decision factor. Users often resort to printed adapters, rewinding tricks or careful slot selection to mitigate these quirks, which re‑introduces manual chores the AMS was meant to erase.

The original AMS versus the AMS 2 Pro

Bambu Lab released the AMS 2 Pro to address the rough edges of the first generation. The upgraded unit adds:

• Built‑in active drying and airtight storage to combat moisture‑related print failures.
• A faster‑feeding motor that reduces pause times during material swaps.
• Easier maintenance access for cleaning and part replacement. While purge waste and multi‑material complexity still exist, the Pro version makes the overall value proposition stronger for users who already struggle with the original hardware.

Real‑world impact on everyday prints

Most practical 3D prints—brackets, mounts, jigs, repair parts—do not require multi‑color capability. Nevertheless, the AMS adds value beyond aesthetics. Having black PLA, white PLA, PETG or support material pre‑loaded means a user can start a print within minutes rather than spending time swapping spools. This reduction in “friction” often decides whether a part gets printed today or postponed. Moreover, the automatic filament backup can rescue a print when a spool runs out, provided the replacement material is compatible.

Cost, waste and the decision to adopt

Multi‑color printing via a single nozzle generates noticeable purge material, extending print times and increasing waste. The AMS hardware itself is a non‑trivial investment, adding sensors, tubes and firmware changes to a printer that otherwise functions well on its own. For users who primarily print single‑color, single‑material parts, the AMS may solve problems they never had. Yet for power users who value rapid material changes and the ability to experiment, the convenience often outweighs the added cost and waste.

Bambu Lab P1S specifications

• Build volume: 256 × 256 × 256 mm
• Maximum printing speed: 500 mm/s
• Supported materials: PLA, PETG, TPU, PVA, PET, ABS, ASA
• Brand: Bambu Lab

The P1S is positioned as a workhorse in the desktop 3D‑printing market, and the AMS (or AMS 2 Pro) is the accessory that can either elevate or complicate that experience depending on the user’s workflow and tolerance for hardware quirks.