AMS upgrade or a second printer: comparing actual needs

Two purchases that fix different problems

The AMS 2 Pro and AMS HT product pages describe filament feeding, drying and sealed storage, subject to each model’s stated conditions and material limits. Maximum temperatures and supported materials differ, so neither is a universal dryer. A second printer provides another build plate for another job, provided you can prepare and monitor work in parallel.

The P1S page advertises up to sixteen colors with four four-slot AMS units and states a maximum of four AMS units for X1/P1 across generations. A setup containing single-slot AMS HT units does not automatically provide sixteen filaments. An available second P1S can run a separate job alongside the first; it does not by itself speed up each part.

Start from your files and exact material. If you need multicolor, the documented AMS units provide a model-dependent filament-changing path. If the issue is drying, compare the recommended temperature and protocol for the exact grade with each unit’s limits; a maximum temperature does not guarantee complete drying. If the issue is a queue, a second machine can allow another job to run, without automatically doubling actual output.

What the AMS 2 Pro and AMS HT actually add

The AMS 2 Pro and AMS HT pages list features including active venting during drying, sealed storage, spool rotation, RFID sync for official Bambu filaments and a motor advertised as 60% faster at feeding. The AMS 2 Pro page also claims an average saving of ten minutes per one hundred filament changes. These are manufacturer statements for those products, not independent tests; the time claim does not apply to jobs with no changes.

The AMS 2 Pro page lists up to 65 °C, reachable only when ambient temperature exceeds 25 °C. It marks certain materials, including ABS, ASA, PA, PC and PVA, with an asterisk and says the unit cannot dry them completely. The AMS HT lists up to 85 °C and its own material set. Compare these limits with the filament maker’s instructions for the exact spool; a maximum temperature alone does not establish that it is adequately dried.

Drying requires a powered-on printer connected through the six-pin bus cable; standalone drying is not supported in the product FAQs. Drying while printing depends on the printer model and minimum firmware version specified by Bambu Lab. Check the exact combination rather than assuming it is available on every machine.

Required accessories change the real cost of an AMS

For a single AMS 2 Pro or AMS HT connected to a non-combo X1/P1, Bambu Lab lists a SA003 buffer or SA002-N hub, a FAZ006 PTFE coupler and a CAB002-N four-pin cable. Included accessories vary by combo and selected configuration; check the box contents for the exact SKU. This is the manufacturer’s listed setup, not a price or availability claim.

For drying, the page says each AMS 2 Pro used with an A1, P1 or X1 requires a Switching Adapter; Bambu Lab lists a mains power cord in the AMS HT box. The AMS HT specification lists 150 W average power while drying. That is a manufacturer specification, not measured workshop energy use or a bill estimate. Check the power requirements for your exact setup.

If you are buying a new P1S, the P1S AMS 2 Combo variant includes the AMS 2 Pro, the 4-pin cable, the Switching Adapter, the Filament Buffer and the coupler, according to the published box contents. That spares you from rebuilding the list piece by piece. Either way, run the numbers in the startup budget tool with today's prices rather than remembered figures.

Color scenario: an AMS on your existing machine

Assumption: you print objects with two to four colors on an existing P1S. A compatible AMS adds filament changes without creating another independent build plate, but needs its own clearance and a supported mounting setup. The AMS 2 Pro page lists 372 × 280 × 226 mm and 2.5 kg, with spool width of 50–68 mm and diameter of 197–202 mm. For a spool outside those dimensions, do not assume it fits or that a validated adapter exists: confirm a compatible solution.

Sequential multicolor carries a hidden cost: every change purges filament and adds time. The manufacturer claims faster feeding, but purge volume depends on your file and the number of transitions per layer. Estimate it with the multicolor purge simulator on your own models before you buy.

For generic TPU or fiber-filled filament, check the exact setup: Bambu Lab describes a manual bypass outlet on the AMS HT, without automatic feeding through that outlet or simultaneous drying under the stated procedure. This does not make the AMS HT a universal solution for all flexible or filled materials; follow the compatibility and instructions for each grade.

Throughput scenario: a second printer running in parallel

Assumption: your parts are single-color, each plate takes hours, and a list of files is waiting. An AMS adds no independent print engine or build plate for running a second file in parallel. A second Bambu Lab P1S starts a second job while the first runs. The page lists a 256 mm cube build volume, with a default printable height of 250 mm in Bambu Studio and a filament cutter stopper that occupies part of the area when popped out. The nominal volume is not fully usable without following the wiki instructions.

The 500 mm/s top speed and 20 m/s² acceleration are toolhead maxima, not job durations. Two identical machines double the number of plates you launch, not the speed of each part. The real gain depends on how quickly you can prepare, unload and relaunch two beds.

The P1S page lists an activated-carbon filter, but does not establish room-air cleaning performance or workshop ventilation requirements for ABS or ASA. Check the filament SDS and local requirements for the space where you print. The printer’s footprint is a separate placement consideration.

A decision grid built on your own inputs

Write down five inputs before buying. First, the share of your sliced files that use more than one filament. Second, the materials you run and the drying temperature their maker recommends, compared with the 65 °C and 85 °C ceilings. Third, the hours per week the bed is busy while a file waits. Fourth, equipment already on hand, including any hub or buffer. Fifth, the money available after checking current prices.

If multicolor is the priority, compare the need with each unit’s material compatibility and stated conditions. The AMS 2 Pro page lists PLA and PETG without an asterisk but says several marked materials cannot be fully dried by that unit; the AMS HT lists up to 85 °C. For PA, PC or soluble support, choose only after checking the exact grade’s requirements: the sources do not make AMS HT mandatory for every such filament or guarantee complete drying.

The AMS HT page illustrates a configuration of up to 24 filaments using four AMS 2 Pro units and eight AMS HT units. That diagram does not fit the four-unit limit listed for X1/P1 series printers. It therefore does not establish compatibility with a P1S; use the multi-AMS connection guide for the exact printer and firmware.

Sources and limits

• Bambu Lab AMS HT - Automatic Material System | Bambu Lab EU Store
• Bambu Lab P1S | 3D Printer with Enclosure and Filter | Bambu Lab EU Store
• Bambu Lab AMS 2 Pro - Automatic Material System | Bambu Lab EU Store

We organize manufacturer and community documentation; we have not measured these products ourselves. The manual for your exact model takes precedence over general guidance.