Replace your Mazzer Mini Electric chute for a new shiny one or replace your bulky doser and install this great unit instead. To make the full conversion you will also need the appropriate backing plate
The screen reduces clumping and static, but is not "necessary".
You may also want to replace the portafilter support fork - if you are using portafilters with spouts on them you will for sure. Bottomless portafilter users won't have to worry about it, but portafilters with spouts on them will stop short of being centered directly beneath the chute using the existing fork. If you have spouts on your portafilters, you will want to select MAZ_8M.
Your existing Mazzer doser lid will fit perfectly. This version is recommended for the Mazzer Mini and Super Jolly, but some customers have expressed that it's a bit short for the Super Jolly, and can get messy. For all other models, use MAZ_250