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MK4 MMU3 Filament Buffer Guide — image 1

MK4 MMU3 Filament Buffer Guide

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This is an adjusted filament guide for the newer R4 "B" version of the Prusa buffer cartridge to help load the buffer

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Updated at source:

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Creative Commons — Attribution — Noncommercial — Share Alike

This is an adjusted part from the MMU3 Buffer Simple Loading Helper by Ruedli
 

I have had better luck after making some slight adjustments to the fit. Time and use will tell if it offers any improvements.