Improved lid for the improved Rancillio Rocky coffee grinder doser

A couple of years ago I created an improved doser for the Rancillio rocky coffee grinder. (http://www.thingiverse.com/thing:38727).

It works great, but coffee grounds _can_ stick on the slide over time, making a clear transfer into the porta-filter a bit awkward.

This lid gives you more lateral movement ability with the plunger, allowing you to sweep all the grinds into the porta-filter ewithout fuss every time.

You will need to go back to the original thing to get the plunger assembl