These guides will take you through the entire upgrade of the extruder to the B7/R3 design. If you printed the parts yourself, use R2 to R3 guide. If you purchased upgrade kit from Prusa, use the B6 to B7 guide.
Upgrading extruder B6 to B7 on MK2.5 (Prusa printed parts)
Upgrading extruder B6/R2 to R3 on MK2.5 (self-printed parts)
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