Doppio
two intersecting cylinders - updated!

Solution

the measuring spoon is the lid and the window to the roaster. 
the number of spoons can vary how strong the coffee will be or (in combination with the right amount of water)  less or more coffee

the amount of water can be measured with measuring lines on the water tank

the wooden line is the main user interface
you can choose here one of the 5 roasting grades indicated by different types of wood, also you can set the timer further below with two buttons and a tiny screen that would also show if you saved a programm via your app. On/Off button is the BV Logo

the silver chaffs are stored after roasting and discarded into the used filter. thrown away with the used coffeeground right away

reference to double wall glass jug principle (this is a bodum one):
http://ecx.images-amazon.com/images/I/41Vx5bicuiL.SY300.jpg

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