Use EasyEDA to open .epro file
| Version | .epro | Altium |
|---|---|---|
| Original version | --- | --- |
| Hall version | PBMCU_C_Hall.epro | PBMCU_C_Hall.zip |
Some users have reported that new versions of the mainboard may have issues, such as unexpected reboots or certain channels malfunctioning despite proper soldering.
The developer is currently working on software-level fixes to address these problems.
If you’d like to try the Hall sensor version, for now you can also try to use the original version of the mainboard with the Hall sensor sub-board.
We have initially identified the source of the instability problem with the new version of the motherboard, we recommend not installing the SS54 diode at position D4, you can short it directly
| Version | PCB manufacturing files | Soldering aids |
|---|---|---|
| Mainboard Original Version | pcb_gerber_main_board_v0.4.zip | soldering_aids_mainboard_v0.4.rar |
| Mainboard with Enhanced Security Patch | pcb_gerber_mainboard_enhanced_security_patch.zip | soldering_aids_mainboard_enhanced_security_patch.rar |
| version | PCB manufacturing files | Soldering aids |
|---|---|---|
| Original version | pcb_gerber_sub_board_v2_2.zip | soldering_aids_sub_board_original_version.rar |
| Hall sensor Version | pcb_gerber_sub_board_hall.zip | soldering_aids_sub_board_hall.rar |
| Version | Firmware | Note | Src |
|---|---|---|---|
| V0.2 | firmwarev0.2.zip | ⭐⭐⭐Recommended for BMCU-A | src-bmcu-0-2.zip |
Firmware from this version onwards is adapted to the BMCU-B aka 370 version aka,
also starting to support the P-Series recognising the BMCU as an AMS system.
| Version | Firmware | Note | Src |
|---|---|---|---|
| 1.21.2 | bmcu_firmware_1_21_2.zip | ||
| 1.26 | bmcu_firmware_1_26.zip | ||
| 2.06 | bmcu_firmware_2_06.zip | For 370 | |
| 2.22 | bmcu_firmware_2_22.zip | ||
| 3.14 | bmcu_firmware_3_14.zip | ⭐⭐⭐Recommended for BMCU-B aka 370 version | src-bmcu-3-14.zip |
| 3.31 | bmcu_firmware_3_31.rar |
Firmware from this version adapted to BMCU-C
| Version | Firmware | Note | Src |
|---|---|---|---|
| 4.9 | bmcu_c_firmware_4_9.rar | ||
| 4.20 | bmcu_c_firmware_4_20.rar | ||
| 4.23.3 | bmcu_c_firmware_4_23_3.rar | ||
| 4.24 | src-bmcu-c-4.24.zip | ||
| 0013 | bmcu_c_firmware_0013.zip | src-BMCU-C-0013.zip |
Change Pid parametres
Added P-Series support (still in beta)
Fixed some anomalies that caused excessive resistance in the extrusion head
Added function: press buffer and then the motor enters a short feeding mode to load consumables
Fixed a possible bug with refills.
BMCU-C is supported for the first time, and the secondary board uses Hall sensors to replace photoelectric sensors.
Currently there is a known bug that all channels show material, regardless of whether the subboard is connected or not
The BMCU will now performs buffer jittering at the stage where it cuts off the filament
From this version onwards, the BMCU can automatically detect the direction of motor rotation, eliminating the need to manually reverse the power supply depending on the model/gear being printed.
The BMCU performs a jitter test to determine the motor direction for each channel and logs it the first time the printer is connected after the firmware is flashed.
If this direction needs to be reset, it is necessary to re-flash or remove the motherboard and press reset.
📢 - Official version from BMCU author @4061
❤️ - Recommended
❤️ QTBZ version, adjustable photoelectric block, optimised triangle clutch
Link Makerworld
Backup link
130 steel ball version
Link Makerworld
📢130 Original version by the author
Link Makerworld
Backup link
❤️ An optimised version collected by Yuekai, almost the author's original design, with the addition of a triangle clutch using springs
Link Makerworld
Backup link
Brackets for A1 and A1 mini, also can be used for early version 370
Link Makerworld
Backup link
📢❤️ 370 steel ball version v3.14:
Link Makerworld
Backup link
370X version by @星尘
Link Makerworld
The seller on AliExpress is selling his 370X model and circuit board without informing
@星尘. If you'd like to support the developer, you can also choose to directly support his work and models.
📢370 version official version V2.5:
Link Makerworld
Backup link
370 extended buffer version - based on v2.5
📢❤️ BMCU-C model release date 11/04/2025:
Link Makerworld
Backup link
BMCU-C Higher torque version
Link Makerworld
The F3D files of the original print files shared by the author are provided here, in case you wish to make additional modifications yourself to the model. Please note that some versions are missing their F3D files.
Missing
130 similar to 370
todo
https://makerworld.com.cn/models/1173680
This section contains known working firmware versions for various Bambu Lab printers. These backups are provided for archival and reference purposes only.
At present, there is no practical need to download or use them, but they are stored here in case Bambu Lab imposes stricter limitations in the future that could restrict third-party tools or modifications.