AMS & Color
Bambu Lab AMS Lite
The only AMS that fits an A-series machine, genuinely good at color changes, and completely open to the room air.
By Michael W. · Published October 5, 2026
Some links here are Amazon affiliate links, so a purchase may earn this site a commission at no cost to you. It does not change what gets recommended or the order it appears in — how that works.
What to know before buying
It is the only AMS for an A1 or A1 mini. There is no decision to make on which unit; the decision is whether multi-color is worth the purge waste and the desk space.
Budget for two more things. A dryer, because open-air spools absorb moisture, and ideally a rack, because four spools above an A1 takes over a desk. That is the honest total cost of multi-color on an A-series machine.
What open air costs you, specifically
Not print quality on day one. Filament sitting in room air absorbs water over days and weeks, and the effects arrive gradually: PETG starts stringing, TPU goes brittle, print surfaces get rougher. Because it is gradual, almost nobody connects it to the spools sitting out in the open.
The tell is a spool that printed well a month ago and prints badly now, with nothing else changed. The full symptom list separates this from the hardware faults it imitates.
The fix is cheap and it is not a different AMS: dry the spool, then store spools sealed with desiccant rather than loaded in the unit between projects.
What it genuinely does well
Color changes. This is its job and it does it reliably on PLA.
Visible failures. When something jams you can see it. On a sealed unit the equivalent diagnosis starts with removing panels.
Price. It is the cheapest entry into multi-color printing in this ecosystem by a clear margin.
The honest limits
No moisture protection, at all. Covered above, and it is the one that actually bites.
No active drying. So PETG, TPU and anything filled need a separate dryer.
A-series only. It will not fit a P1S, and the P-series units will not fit your A1.
Desk footprint. Four spools above an open-frame machine is a lot of vertical and horizontal space.
TPU is awkward for the same path-geometry reason as on any AMS — TPU in an AMS.
How it compares
AMS 2 Pro vs AMS Lite is really a printer question rather than an accessory question, and that page says so. If you are choosing a machine in the first place, A1 vs P1S covers which AMS you end up eligible for.
What to buy
Stock photograph of this product class, not of this specific unit.
#ad We earn a commission · live price shown on Amazon
1. Best for the A-series
Bambu Lab AMS Lite
Four colors on the cheapest printers Bambu makes, with zero moisture protection.
A compact, open-air four-spool variant for the A1 and A1 mini. If you own either machine this is not a comparison — the sealed units do not fit.
Taken on its own terms it is good. Four-color printing on an open-frame machine, at the lowest price any multi-color hardware in this ecosystem costs. And the open design means a jam is visible and reachable instead of being a teardown, which matters the first few times it happens.
The weakness is structural: spools sit in room air. In a dry room with PLA that is fine. With PETG, TPU or in a humid climate it is the reason prints get slowly worse over months.
What it gets right
- The only way to get four-color printing on the A-series, and it does it well
- Open-air design makes a jam visible and reachable instead of a teardown
- Cheapest multi-color hardware Bambu sells
What it does not
- Open air means zero moisture protection — in a humid room your filament is exposed between prints
- No active drying and no sealed chamber, so PETG, TPU and nylon all need a separate dryer
- Not compatible with the P-series or X-series
| Type | Compact, open-air four-spool variant |
|---|---|
| Fits | A1 and A1 mini |
| Enclosure | None — spools sit in open air |
Questions people actually ask
Does the AMS Lite fit the A1 mini?
Yes - AMS Lite is the unit for both the A1 and the A1 mini, and it is the only AMS that fits either. The sealed AMS and AMS 2 Pro are for the enclosed P-series and X-series machines.
Does the AMS Lite dry filament?
No. It is an open-air unit with no enclosure and no heater, so spools sit in room air. If you print PETG, TPU or anything filled, buy a separate dryer and store spools sealed with desiccant between projects.
Why do my AMS Lite prints get worse over time?
Almost certainly moisture. Spools sitting in open air absorb water over days and weeks, and the effects arrive gradually - stringing on PETG, brittleness in TPU, rougher surfaces. The tell is a spool that printed well a month ago and prints badly now with nothing else changed.
Can I use an AMS 2 Pro on an A1 instead?
No. The sealed AMS units are not compatible with the A-series. If you want active drying on an A1, the route is a standalone filament dryer alongside the AMS Lite, or a dryer you can print directly from.
Sources
Read this next
- AMS 2 Pro vs AMS LiteThe AMS 2 Pro fits enclosed machines and the AMS Lite fits the A-series. What each does, and the gap you have to fill on an A1.
- Multi-color printing without an AMSHow to print two or three colors with no AMS and zero purge waste, and the point at which the manual method stops making sense.
- AMS not loading filamentThe four real causes of an AMS feed failure in diagnostic order, three of which cost nothing and take minutes.
- The best filament dryers in 2026Dryer picks split by temperature range and capacity, because a 70 C unit and a 110 C unit are different products for different materials.
- Bambu Lab A1What the A1 does well, the open-frame limit that defines every upgrade decision from here, and the two routes past it.