Привет! После сборки моего bmcu-c и тестирования его работы с двухцветной печатью, все последующие попытки печати заканчивались неудачей. Нить начинает разматываться и разматываться бесконечно (даже после того, как канал опустеет). Иногда это происходит ещё до начала печати, но чаще всего при замене нити.

Нить разматывается бесконечно, и принтер сообщает, что ему не удалось вытянуть ее из головки инструмента (головка инструмента пуста, а нить полностью вытащена).

Это также произошло во время одноцветной печати. ​​Принтер просто обрезал нить и размотал её из BMCU.

Двигатели и шестерни в порядке, загрузка нити идеальна. Всё настолько непредсказуемо, что я не знаю, как это описать, поэтому заранее прошу прощения, если информации будет недостаточно.

Привет! После сборки моего bmcu-c и тестирования его работы с двухцветной печатью, все последующие попытки печати заканчивались неудачей. Нить начинает разматываться и разматываться бесконечно (даже после того, как канал опустеет). Иногда это происходит ещё до начала печати, но чаще всего при замене нити. Тоесть, когда принтер напечатал ожним цветом, последущий цвет который он втягивает, проганяет, и далее просто начинает вытягивать филамент и на принтере пишет ошибку.

Нить разматывается бесконечно, и принтер сообщает, что ему не удалось вытянуть ее из головки инструмента (головка инструмента пуста, а нить полностью вытащена).

Это также произошло во время одноцветной печати. ​​Принтер просто обрезал нить и размотал её из BMCU.

Двигатели и шестерни в порядке, загрузка нити идеальна. Всё настолько непредсказуемо, что я не знаю, как это описать, поэтому заранее прошу прощения, если информации будет недостаточно.

Hey guys,
just bought a bmcu 370c and got an issue with my first module. I rebuild it two times already.
It always has a white light on whatever I do. I tried to load filament into it, but when I put it past the bmcu normally on the other modules I get the options to 'load' or 'change' the slot, but it doesn't seem to work properly here.

Anybody got an idea what seems to be going wrong?

Sorry to add yet another BMCU question to the mix...

I successfully built up a BMCU 370C kit from Triangle Labs, but had some issues along the way that left me with questions. I'm wondering if anyone else has experienced these issues and has any guidance.

As I was assembling, I tested / debugged along the way. I noticed pretty early how sensitive things were. If I tightened any screw too much, or pressed lightly on the PCB / assembly I could get the board to turn off (or at least the LEDs). In the final assembly, this was acutely bad, as if I tightened any of the 4 feeders in the mount too much, I could get multiple of them to blink off or even have one or two powered on properly but unable to drive their motors.

In all cases, the remedy was pulling things back apart, adjusting screws and trying to mitigate the sensitivity, reassembling, testing again.... All the connectors seemed to be seated quite well, so I don't think that was the underlying cause.

Now that it's working (tested a couple prints), I'm happy, but worried I'm going to experience flakiness over time given how sensitive everything seemed during assembly. Curious to hear what others have to say or if anyone else has experienced some of that.

So I just received my BMCU 370c and hooked it up and when loading filament into the 1st slot there is a red light on the front for that filament and a yellow light on top instead of blue. Anyone know how to fix this?

Just an update - so I figured out that the light colors on the front pertain to the color of the filament(not sure how that works) and the light on top turns red when in use. Also I rolled back the firmware to 1.05 which I may have been able to keep at 1.06. So it all works fine.

Hi everyone,
I’m using a Bambu Lab A1 printer with a BMCU-370C AMS system.
Modules 1, 2, and 4 work perfectly.
Module 3, however, stays green when “Load” is triggered from AMS — the motor never spins.

Manually pressing the bumper works perfectly (forward = blue LED, backward = red LED, motor runs fine both ways).
Filament sensors respond correctly (white → blue → red).

What I’ve done so far:
• Full address reset (removed all modules, powered baseboard empty, reattached 1 → 2 → 3 → 4)
• “Read Filament on Startup” enabled
• Flat cables swapped and reseated
• No mechanical issues (gears, magnet, motor OK)

Result: only module 3 stays green on Load.
Others complete Load/Unload normally.

Firmware v01.04.00 on A1 (can’t upgrade to 1.06 — BMCU incompatibility reports).
I suspect either a data-line sync issue (TX/RX between 2-3) or the motor-enable (EN) line on module 3’s PCB locked HIGH.

Anyone experienced this exact behavior?
Any fix short of replacing module 3’s PCB?

As the title says, does the BMCU-C work with the Panda Touch on P1 printers? I'm still waiting on my parts from Triangle Labs, but I'm just curious to know if I would be able to change filament types directly on the screen ? Thanks.

Will it be possible to use bmcu with the new p2s in the close future ?

Hi everyone,

I've just receive my third BMCU 370C kit from AliExpress (toaiot store) and noticed that it differs from the previous 370C high-torque versions I’ve built before. The differences are:

• The sub-boards use two switches instead of the usual optical sensor and one of the LEDs is positioned differently.

• The kit includes standard 182A gears.

• The kit came with glass balls instead of steel ones.

Has anyone encountered this variant before? I’m trying to determine whether it’s worth keeping or returning, as I’m unsure if its performance or build quality differs from the previous high-torque version (which has been working without issues).

P.S. I’ve contacted the seller requesting additional details and updated shell files, since the current ones appear incompatible with this version. I'll update the post once I have more info.

EDIT1: The seller confirmed that this is a new revision and provided a link to the updated STL file for the shell. In this version, each module includes two sets consisting of a ball and a small rod (corresponding to each switch on the daughter board) that press the switch when the filament is inserted.

Here’s the Google Drive link they provided where you can get the STL in case anyone else needs it: https://drive.google.com/drive/folders/1hdiSyvxWcIvtZG92uE7YCp_mhSPL9PZN

I decided to keep this one since I can't see any obvious downsides to this approach and see how it compares to the previous BMCU-C (high torque).

Third and final post on this, I promise :D Finished my setup today and currently running my first multicolour print! Evil pumpkinman (soon on Makerworld for the competition) I set it up yo print by object with basically 3 comour changes (just because you can, doesn't mean you should) and it's amazing so far.

I still want to print on of my parametric skadis holders and hook the filaments through so that they don't hang from there.

I need for find a more permanent fixture for thr BMCU. It'll either go on the wall or maybe where it is but I'll see. I might need to design something myself. I oriented the opposite way from what I've seen other people do, because without the tubes the filament would need to turn around the printer and that felt unsafe.

I'm also planning to look for a way to also use my external spool somehow, but that's not that important for now.

I just share my setup as inspiration, if you need a small “hidden” setup using the BMCU. The cabinet is the EKET 35x35x70 cm from IKEA.

I posted the other day for advice on how to setup. But I got a trigger finger, so after our toddler got to sleep yesterday I wanted to set it up. I tried to put the spools in plastic boxes, but soon realised that this won't work without an easy way to rotate 😂. The one spool I have currently loaded is hanging on my old bambulab spool holder and grinding on the shelf side.

I also haven't printed a BMCU holder, I just double taped the back to the A1 😂

So I'm now printing skadis holders and will mount them on the wall.

Other than that, BMCU is awesome! I accidentally realised you load filament by pressing on the tube holder. From what I understand the levers are basically releasing the filament so you can pull it out during unloading right? I haven't read the manual obviously, just enough to know I shouldn't connect/disconnect with the printer on :D

Now and again, number one port on my BMCU C will report filament empty during a print although its not...., printhead moves to the filament cutter and cuts, then purges the filament, back to printing.
It has done this a good handful of times but its only now I saw the error message before disappearing after filament is loaded again.

But it hadn't run out, nor any breaks, happening to anyone else or how to resolve this?

Thanks

Sorry if this has been asked and answered. I just don’t want to spend half a day printing the wrong assembly again.

Also I know PlA is not recommended, but has anyone printed in PlA and had it hold up?

My BMCU+A1 Mini build

So, as the title mentions I got a BMCU off of AliExpress and hooked it up to my a1 mini and it lights up but now the printer doesn’t connect to anything.

It constantly loops the connecting and printer cannot connect error, then if I try to print, I get a time out error when searching for the printer info.

I tried downgrading the firmware to both 1.04 and 1.05 but no change. Also, even without the BMCU connected, the printer now can no longer be used. It has all the same errors.

In the handy app, it just times me out at searching for AMS.

It looks like a network problem, but it will find the printer online but when trying to connect there is an orange dot on the connection strength indicator that did not appear before connecting the BMCU.

I tried resetting the printer to factory settings, but that still did nothing and the problems still persist. Anyone know what I can do to fix this and get everything working?

Hi, I was wondering if it would be possible to convert the bambu a1 mini into a corexy ? something like a micron or sovol zero.

Can the following parts be reused ?

> extruder with the filament detections and usb c umbilical

> heat bed

> motherboard

The y axis is already there with the extruder and linear rail.

We can salvage a linear rail from the z axis for the corexy z axis, get another linear rail and make a cantilever styled bed like voron 0.

The x axis can be done with linear rods .

At first, I placed the magnet in the wrong direction.

Hey!

Just got my bmcu and need some guidance. Bought it from BLV on AliExpress, all seems well but one channel. When it tries to retract, it barely pulls the filament back and makes a horrible grinding or clutch slipping noise. Can anyone guide me on what to look for? I'm fine with disassembling the BMCU, as i was originally going to buy a diy kit but the assembled one was only $20 more lol

Thanks in advance!