H3C

Nine tools that stay loaded make material switches fast. Bambu's own FAQ and wiki also spell out where that design sets limits:

• Extra AMS units run through one tool. Beyond the nine spools in the AMS 3H, the H3C takes up to four AMS, AMS 2 Pro or AMS HT units, and only on PrintTool No. 1. They connect through the Buffer for External AMS, which is not in the box: $24.99 in Bambu's US store, and buffers from earlier Bambu printers don't fit. Several units also need Bambu's 4-in-1 PTFE adapter II. Spools beyond the nine tools share that one filament path, so changes between them purge and waste more filament than a tool switch. (Bambu H3C wiki FAQ, multi-AMS guide)
• Two drying slots. The AMS 3H dries slots 6 and 8 at up to 85°C; the other seven slots are sealed but not dried. For more drying, Bambu points to extra AMS 2 Pro or AMS HT units on the buffer, and on the H3C an AMS 2 Pro dries only on its own power adapter, because the printer does not power its dryer. (Bambu H3C wiki FAQ)
• PLA next to engineering filament in the dryer. Slots 6 and 8 share one drying chamber. If both hold filament for the same print, the drying temperature has to suit the more heat-sensitive one: Bambu's PVA guide sets 55°C when PLA shares the chamber, because PLA softens above that and can jam the extruder, while the dryer reaches 85°C for PA and PC. Bambu also limits drying while printing to filaments that stay dimensionally stable at drying temperature. (Bambu H3C PVA guide, Bambu H3C page)
• Each spool prints through its own tool. Every AMS 3H slot has its own path to one PrintTool, so a filament prints with that tool's nozzle size, and mixing sizes means buying extra hotends. Bambu says the H2C's automatic pairing of any filament with any nozzle size is something the H3C doesn't replicate, and calls the H2C especially valuable for engineering materials and shared printers. H2C vs H3C (Bambu US store, H3C FAQ)
• Unloading is hands-on. To swap a spool, you unload it on the screen and turn the spool by hand to wind the filament back, as Bambu's first-print guide describes. (Bambu H3C first print)

From Bambu's H3C FAQ, wiki and store pages, read November 4, 2026; not tested by us.

Bambu's SwapTek rack holds nine PrintTools. Each has its own heater, cutter and filament path, so every material stays loaded, and Active Pre-Heat warms the next tool while the current one prints. Bambu gives 3.4 seconds per tool change and 6 seconds per material switch. The H2C, Bambu's previous multi-material printer, swaps only hotends: one fixed hotend plus six induction-heated hotends from its Vortek rack.

Swapping is not waste-free. Bambu advertises 0.038 g of purge per change; CNC Kitchen, after almost 400 hours on a test unit from Bambu, measured about 50 mg on the prime tower per change, close to 200 g on a print with more than 4,000 changes. A material switch took 6 to 7 seconds in that test, a little over 10 seconds when the tool also printed the tower's outer wall.

One of the nine tools takes 2.85 mm filament. Bambu's TPU 75A in that size costs $28.79 in its US store and works with none of the AMS, AMS lite, AMS 2 Pro or AMS HT; it feeds through the bypass. Bambu says the FlexFeed extruder prints TPU this soft at up to 3× the flow rate of traditional printers.

Everything Bambu showed before and at the reveal

Both are sold only with an AMS, so the $600 gap compares complete systems. Full comparisons: H2C vs H3C and H2D vs H3C.

• Long-term wear of the tool docks and PrintTools over thousands of swaps
• When Bambu publishes the first H3C firmware release notes; its wiki page says coming soon
• Which 2.85 mm materials follow TPU 75A, and when; Bambu's FAQ only says more flexible ones are on the way

We'll update as data comes in. News