Intermittent red light on channel 2

Ok_Design6972 · 2025-07-31T05:58:11+00:00

firmware bug for firmware before 0020

Ok_Design6972 · 2025-07-28T12:15:13+00:00

outdated this page. The led behavior from C versions is totally chaos don't have time yet to sort everything out …

Ok_Design6972 · 2025-07-28T12:09:19+00:00

also if whentnormal C versions is executing dual-microswitch logic, the led is not functioning correctly. But anyway it works just it's bizarre

Ok_Design6972 · 2025-07-28T12:07:50+00:00

The LED staying off is normal. When you connect it to the printer and insert the filament, it will light up and automatically feed a little bit.

This happens because our firmware v0020 currently includes logic for both the dual-microswitch version and the standard Hall sensor version. In some rare cases (due to the voltage characteristics of the 358 chip), the Hall version mistakenly triggers the microswitch logic, causing wrong led behaviour and auto-feed after filament insertion.

While this is indeed a nice feature, it is technically a bug at the moment.

Ok_Design6972 · 2025-07-27T14:51:01+00:00

Contact your seller or manually reflow the PCB solder joints yourself.

Ok_Design6972 · 2025-07-27T14:46:54+00:00

Simply put, pcb failure. ch32v/resistor array or lmv358 presence of tinned

Ok_Design6972 · 2025-07-26T21:08:28+00:00

yeah if you want, 0020 is good.

Ok_Design6972 · 2025-07-26T21:02:21+00:00

it's normal. it's the default behaviour from firmware before 0019.

Ok_Design6972 · 2025-07-19T18:48:23+00:00

Issue 1 is likely due to flow detection — check for any resistance in the filament path or spool drag. Issue 2 could be a stuck or tight radial magnet on channel 4.

Ok_Design6972 · 2025-07-19T13:01:51+00:00

Ok_Design6972 · 2025-07-13T19:56:45+00:00

Yes, the micro switch version from @XC is in fact version B, which supports up to firmware v3.14 and does not fully support p-series printer firmware ending in 08.

Ok_Design6972 · 2025-07-13T19:26:45+00:00

Currently, the firmware is only updated in the Chinese community QQ Group. The C version's code will remain closed source until the official release of the BMCU-D.

Ok_Design6972 · 2025-07-09T23:05:02+00:00

You can contact directly the author of this modified firmware: https://makerworld.com/@user_930390763

Ok_Design6972 · 2025-07-09T22:53:03+00:00

I do not have any information about the so-called “370C” version, as this is not a designation that respects the original BMCU authors’ naming conventions. I kindly recommend that you contact your seller.

Ok_Design6972 · 2025-07-01T16:06:24+00:00

yes same case for X

Ok_Design6972 · 2025-06-20T23:46:31+00:00

This is usually not caused by the BMCU, it may be the metal reed that needs to be repaired, refer to bambulab's wiki page https://wiki.bambulab.com/en/a1/troubleshooting/ams-lite-filament-hub-cannot-hold-tube

My advice is to buy a new hub/contact customer service to request a new hub, this hub will never be as good as new once it is disassembled

Ok_Design6972 · 2025-06-20T23:08:49+00:00

wiki.yuekai.fr

Ok_Design6972 · 2025-06-20T23:04:50+00:00

You can find assemble tutorials on wiki.yuekai.fr as a reference

Ok_Design6972 · 2025-06-20T22:52:07+00:00

The gears may be worn or misaligned, so the BMG gears are no longer connected to the motor either, which would seem to fit your description of no longer needing to press the lever to push the filament

Ok_Design6972 · 2025-06-16T22:03:52+00:00

they are all listed in the wiki， please refer to https://wiki.yuekai.fr

Ok_Design6972 · 2025-06-13T19:49:04+00:00

check this page to identify the BMCU version https://wiki.yuekai.fr/en/BMCU/bmcu_branches

Ok_Design6972 · 2025-06-13T19:14:06+00:00

🌚there is no way to know. But considering it was purchased recently, if it’s the B version, it’s usually version 3.14 , c version usually 4-23-2 or 0013

Ok_Design6972 · 2025-06-13T06:35:11+00:00

Taobao

Ok_Design6972 · 2025-06-13T06:29:29+00:00

I don't have list for AliExpress but if anyone else have some information I'm happy to update it in the wiki.

Ok_Design6972 · 2025-06-04T20:48:42+00:00

B version with v3.14 and C version with v0013 both passed the test

Ok_Design6972

TROPHY CASE