This page still in progress because I don't have all the information for BMCU on P series.
Update 5th May
In firmware versions :
01.08.00.00 for the P series
01.09.00.00 (20250429) for the X seriesBambulab has added support for the updated AMS model like AMS 2, which involved changes to the communication protocol between the AMS system and the printer.
As a result, BMCU currently does not function properly (e.g., unable to modify filament settings). It is unclear how soon BMCU's author will respond to these changes. If you intend to keep your P/X printer updated with the latest firmware, we recommend not relying on BMCU at this time.
The A-series is not affected at the moment, according to Bambulab the adaptation programme for the newer AMS for the A-series is still a few months away.
¶ BMCU Version Adaptation Status
- BMCU-A: Not supported; no plans for future adaptation.
- BMCU-B: Fully supported and running well on the P-Series.
- BMCU-C: Currently not supported; adaptation planned for future updates.
¶ If using externe 5 way
You will need a bambu 4-in-1 ptfe adapter or anything similar.
And you need a firmware to make the rejection behaviour longer so that the filament can always exit to the outside of the bambu 4-in-1 ptfe adapter.
¶ if using internal 5 way
¶ Firmwares
These firmwares are modified by XC @星尘
¶ BMCU-B
¶ 3.14
Externe 5 way:
Internal 5 way:
¶ BMCU-C
¶ 4.24
Using internal 5 way:
- P_Hall_4_24_Int5Way.bin.zip - Different springs required:
WD0.6 OD12 L30 mmfor buffer andWD0.6 OD4 L15for lever
¶ Using AMS + BMCU or 2*BMCU
¶ AMS + BMCU
The principle of the BMCU is to directly simulate the AMS device to communicate with the printer, it is possible to use AMS + BMCU on the P-Series, (I can't say for sure for newer devices like AMS 2)
See the official Bambulab tutorial for using two AMS https://wiki.bambulab.com/en/x1/manual/Connect-AMS-Hub-and-multi-AMS
Since the BMCU only has one 4pin connector, you need to connect the AMS directly to the AMS Hub, and then connect the BMCU to the AMS.
¶ 2*BMCU
Please note that it is not possible to use two BMCUs directly on the P-Series.
- Software limitation: You need to modify the firmware so that the two BMCUs get different addresses.
- Hardware limitations：Not enough AMS interfaces