BMCU Product Documentation¶

Welcome to the Toaiot BMCU product documentation center. Here you will find firmware, user manuals, 3D models, and tutorials for BMCU (Bidirectional Buffer Module) products.

What is BMCU?¶

BMCU (Bidirectional Buffer Module) is a filament buffer system designed for 3D printers. It helps manage multi-color printing and AMS auto-feed systems by providing intelligent filament buffering and switching.

Key Features¶

• Automatic filament switching
• Support for multiple channels (A, B, C, D)
• Real-time status indication via RGB LEDs
• Compatible with Bambu Lab printers

Product Versions¶

BMCU 27-5¶

The standard version using mechanical micro-switches for filament detection. Suitable for most users.

BMCU 27-5 Details

BMCU 370C¶

The advanced version using Hall sensor technology for contactless detection. No mechanical wear, more precise.

BMCU 370C Details

Quick Start¶

Step 1: Choose Your Version¶

• Standard: BMCU 27-5 (mechanical micro-switch)
• Advanced: BMCU 370C (Hall sensor)

Step 2: Select Firmware¶

Choose firmware based on:

• Hardware version (27-5 or 370C)
• Channel position (A, B, C, D)
• Filament return distance (15cm recommended)

Firmware Download List

Step 3: Install¶

1. Print the base bracket (if needed)
2. Mount BMCU to your printer
3. Flash the appropriate firmware
4. Configure and test

Guides¶

• LED Status Guide - Understand LED indicators
• BMCU Burning Tutorial(UART) - How to flash firmware
• Base Bracket STL - Download 3D models

LED Status Quick Reference¶

For detailed LED status information, see the LED Status Guide.

Compatible Printers¶

• Bambu Lab P1P
• Bambu Lab P1S
• Bambu Lab X1C
• Bambu Lab X1E
• Bambu Lab A1 (with base bracket)
• Bambu Lab A1 mini (with base bracket)

Technical Support¶

For additional support, please contact Toaiot or visit the official documentation.