Bambu Lab P1S AMS 2 Pro Combo vs Buying Separately: What Is in the Box?
If you buy the P1S and AMS 2 Pro separately, the standalone AMS 2 Pro box does NOT include the P1S filament buffer or the 24V 4A Switching Adapter needed for drying—you must also buy Upgrade Kit 1 (Buffer) or Upgrade Kit 2 (AMS Hub). The official P1S AMS 2 Pro Combo bundles the printer, the AMS 2 Pro, and the accessories together, shipping with the 4-port AMS Hub instead of the single-unit filament buffer. Last checked October 25, 2026.
One of the most common mistakes buyers make is ordering a standalone Bambu Lab P1S and a standalone AMS 2 Pro, only to discover upon unboxing that they cannot connect them or use the dryer without extra parts. Here is the exact hardware breakdown from Bambu Lab’s P1S installation wiki and store listings as of October 25, 2026.
P1S AMS 2 Pro Combo vs. Standalone boxes compared
| Included Item | P1S AMS 2 Pro Combo | Standalone P1S + Standalone AMS 2 Pro (No Kit) | Standalone P1S + AMS 2 Pro + Upgrade Kit 1 |
|---|---|---|---|
| P1S 3D Printer & AMS 2 Pro | Yes | Yes | Yes |
| Buffer / Hub Included | AMS Hub (supports up to 4 AMS units) | Missing (cannot connect to P1S) | Filament Buffer (supports 1 AMS unit) |
| 4-Pin Bus Cable (Printer to Buffer/Hub) | Yes | Check regional box (included in Upgrade Kit) | Yes |
| New 6-Pin Bus Cable (2.5 mm step) | Yes | Yes (included with AMS 2 Pro) | Yes |
| 24V 4A Switching Adapter (for Drying) | Yes | Missing (cannot use 65 °C dryer on P1S) | Yes (included in UK Upgrade Kit 1 listing) |
| PTFE Tubes & Couplers | Yes | Partial (missing buffer-to-printer tube setup) | Yes (one 370 mm, two 550 mm, couplers) |
Why the Combo includes the AMS Hub instead of the Buffer
According to Bambu Lab’s P1S installation wiki, the P1S AMS 2 Pro Combo ships with the AMS Hub in the box rather than the single-slot filament buffer. That gives Combo buyers an immediate advantage if they expand later:
- With a Filament Buffer (from Upgrade Kit 1), you can only connect one AMS 2 Pro to your P1S.
- With the AMS Hub (included in the Combo or Upgrade Kit 2), you can connect up to four AMS units to your P1S without replacing the rear mounting hardware.
Which option should you buy?
- If you do not own a P1S yet: Buy the P1S AMS 2 Pro Combo. It includes the mounting hardware, cables, and the multi-unit AMS Hub out of the box.
- If you already own a P1S and want 1 AMS 2 Pro: Buy the standalone AMS 2 Pro + Upgrade Kit 1 (which includes the filament buffer, 4-pin cable, PTFE tubes, and the 24V 4A Switching Adapter).
- If you already own a P1S and want 2 to 4 AMS units: Buy the standalone AMS 2 Pro + Upgrade Kit 2 (which swaps the filament buffer for the AMS Hub), plus additional 24V 4A Switching Adapters for each unit you want to dry simultaneously.
For a detailed comparison of the two accessory boxes, read our Upgrade Kit 1 vs Upgrade Kit 2 breakdown.