I made this long buffer as an alternative to the bulky buffer plates for the MMU3. Its designed to slot in the removable pieces included in the new buffer design. 

For the wheel and segment construction, you can find the stls here - [https://www.printables.com/model/531604-mmu3-printable-parts/files](https://www.printables.com/model/531604-mmu3-printable-parts/files)

In folder - BUFFER - R4 (R4 for MMU3 for MK4).

Parts needed to complete assembly (included in MMU3 build/upgrade kit):

• Buffer Segment (10x)
• Wheel (5x)
• Ball Bearing 693-2rs (5x)
• Shaft 2.9x8.5 (5x)
• M3n nut (15x)
• M3x6 screw (25x)
• Collet (10x)