Cooperative BMCU PCB Purchase
>>>MAJOR UPDATE<<<

It has just come to my attention that Triangle Lab is currently selling a complete BMCU kit, as well as a fully assembled BMCU.  With shipping, they are at the same price point this project would have been $75 plus shipping.  Therefore, it no longer makes sense to complete the group order (and not enough people actually paid to make it cost effective), as this will get us all the product faster.   I will be issuing refunds for the few of you who sent in payment this week.   You can order your BMCU as a kit, or fully assembled from Triangle Lab at:

https://www.trianglelab.net/products/bmcu

I have ordered from Triangle Lab in the past, and have found them to be a reputable company.

There is a great wiki that shows how to assemble the kit at https://wiki.yuekai.fr/BMCU/BMCU_Tutorial

Introduction (as translated from https://oshwhub.com/bamboo-shoot-xmcu-pcb-team/bmcu)

BMCU is designed based on open source data, the protocol introduction of bambubus on Github, and the reference data provided by netizens, so we designed a system that simulates AMS operation, suitable for A series printers. BMCU is specialized on AMCU, and many designs refer to the working principle of AMS lite that can be found on the Internet.

Because its design uses a lot of open source content and its functions are too similar to AMS lite, BMCU is open source and not allowed to be commercialized. It is only for personal DIY learning use.

Features of BMCU

1. The material does not need to be returned to the material break detection like AMCU, but can be returned to the five-way, and the material switching speed is faster.

2. Side-by-side structure, no rack included, which means you can put the consumables in a sealed box and let it feed your printer

3. It has a buffer that can actively feed the material before the printer triggers the winding of the material, preventing problems caused by excessive resistance of the consumables

4. Device standardization. When designing machinery, we set many components to unified parameters, which increases the success rate of one-time DIY and prevents cost increase.

5. BMCU has explored the photoelectric detection design, which allows the photoelectric switch to detect transparent consumables, eliminating the resistance and instability of consumables caused by the micro-motion detection method. The photoelectric design will use other open source protocols separately, allowing borrowing

Other notes

Attachment: BMCU integrated package file, which contains all the files required for BMCU manufacturing, including parts list, print STL file, and purchase link for developers to use (English translated version is here, includes PCB Gerber files, STL files, BOM for other parts)

Note: Before choosing a component purchase source, please check whether the package and other parameters are consistent with those of the recommended version.

The rest of the guide, including the source code for firmware, will be open sourced on gitee at: https://gitee.com/at_4061N/BMCU

KEEP IN MIND, THIS IS AN OPEN SOURCE PROJECT, I DID NOT DEVELOP IT.   I AM JUST GOING BY TRANSLATED DIRECTIONS THE SAME AS YOU, THERE IS NO GUARANTY THAT THIS EVEN WORKS, OR THAT ANYONE WILL SUCCESSFULLY BUILD IT, ALTHOUGH BASED ON MY RESEARCH, I REASONABLY BELIEVE THAT IT DOES WORK, AND BELIEVE THAT THERE IS SUFFICIENT INFORMATION AVAILABLE TO BUILD IT.   THERE ARE NO ASSEMBLY INSTRUCTIONS AVAILABLE TO US AT THIS TIME, SO SOME OF THIS IS SIMPLY COMMON SENSE AND INTUITION AT THIS POINT.