r/BMCU

Guys I have a problem. I updated the bmcu with the latest firmware and i tried all the previous firmware in my a1 mini but nothing works. What can I do??

https://preview.redd.it/dw1mssdphr1h1.png?width=1185&format=png&auto=webp&s=58cac778be417ebd6aa5cc1229bccd3cad6123d1

https://preview.redd.it/likmoqivhr1h1.png?width=1146&format=png&auto=webp&s=111348942a1955442c49269defd5739e6dec74cf

Just want to know the difference between the two or if there's a better model for a casual user, not like a print farm or anything. Is it worth the extra $20 to buy a pre-assembled version? I would also need to buy the PETG filament to print out the shell. What spool holders do you guys use?

In the middle of a print it just started making sounds, and it didn't have the strength to pull nor push anymore. The other 3 channels work fine. I tried to find a solution but it seems that I would need to open the BMCU to see the problem, maybe related to the gears? But I don't understand this stuff. I bought mine completed, I didn't build it.

Does anyone know a tutorial for this? Thanks!

Hi, I am on the edge of buying a bmcu for my a1 mini since it sounds really good. I do have few ququestions.

1. What is difference between 370c, 370c dm and 370c dm pro (all from triangelabs). And which should i buy since i am on a budget and 370c is cheapest.

2. If I buy diy then i have to print my own case. So i found this on makerworld. Does it fit all the 370c versions i listed previously or only some.

And any important tips or info before buying?

Hi, guys. Could you help me troubleshoot my bmcu module. 370c hall.

At first it became to make a grinding sounds after a hour of work after a buy.

I've reassembled it a lot of times, trying to fix things, but still have problems.

1. Changed the worm gear from to the new one from package - still not fits well and sounds scary on filament feeding
2. Chinese assemblers has added a so thin wires from motor to the plate, they were cut of on every second time i've reassembled module. I've changed wires to the 0.25mm then to the 0.4mm
3. Then I've printed the new worm gear increased outer size by 3%, it fits perfect, but after install this module has worked 20-30 seconds and now its not rotates the motor.

What steps I've made after motor stops to rotate:

1. Updated a firmware to the latest from github. After connect to the printer i've calibrated all well, then tried to recalibrate - it does not helped. All modules are rotate motors, this on doesn't. But all leds are working the same - lights blue on pull, then green on rotate. Lights red on push, etc.
2. Check the motor - I've connected it to the 15v battery - it rotates, both sides when change the polarity.

radial magnet on the gear is intalled well too

3. Also measuring voltage on the motor contacts is showing 0 when press feeder.

Is my plate died or what? ) What can i cheсk more and what can i do?

UPDATED: I'm fixed this by setting another worm gear. The first one was too tight and looks like motor can't rotate it. The new gear have more free space and now it rotates well.

Hi everyone,

I have a problem with my BMCU 370 (Hall sensor version). When the printer triggers a filament change, the BMCU only retracts the old filament about 1 centimeter and stops. Then it immediately tries to load the new filament, but since the old one is still sitting in the path, the new filament has nowhere to go and crashes into it.

What I've tried so far:

• BMCU firmware version: 10.5
• Printer: Bambu Lab (AMS emulation)
• Bambu Lab firmware: latest version
• Flashed firmware using bmcuflasher (Auto online mode)
• In the firmware settings, I manually set retract length to 9.5 cm (also tried 10 cm and 20 cm)
• The settings seem to have no effect at all - the actual retract is always ~1 cm

Hardware:

• BMCU 370 (Hall)
• Connected to Bambu Lab printer (AMS emulation)
• Firmware flashed via bmcuflasher

What I need:
Why is the firmware ignoring my custom retract length settings? Is this a bug, a calibration issue, or am I missing something obvious?

Video attached shows:

1. Filament change starts
2. BMCU retracts ~1 cm and stops
3. New filament tries to load into the old one → jam

Any help would be greatly appreciated. Thanks!

I just installed the bmcu 370c on my a1m, what should I do now? update printer or bmcu firmware? and why can't I change the colors of the filaments? just these ones from the image I sent

https://preview.redd.it/6hjo3b8dd71h1.jpg?width=927&format=pjpg&auto=webp&s=291acc2990388c871fa12465253bd9fb0ac8de13

https://preview.redd.it/ra4p9gkid71h1.jpg?width=928&format=pjpg&auto=webp&s=22b5f732e596ec61ed0e67b4f42db50ee4d11e76

Hi, today i recieved my bmcu370c. When i connect it to my printer (A1) i get a notification that the current firmware only supports ams lite, when I switch to the other ams firmware i get the same notification. My printer is on firmware version 01.08.00.00 and honestly I don’t know how I can see what version my bmcu is on. How do I fix this? I tried downgrading to 01.05.00.00 but that didn’t help. Open to all suggestions

Does anyone know how to flash BMCU using 4 pins and which serial reader to buy for it, it has the 4 pins on the back, and what is the pinout of the pins? Also does it use 3.3 or 5v?

I bought an older style BMCU that requires the additional TTL connector to flash the firmware. It's not the end of the world, but it's an extra bit of hardware that you have to deal with as opposed to just plugging in a USB C cable.

How hard would it be to upgrade from the uart to USBC? Hey Do you have to change the whole motherboard?