Two blocks: the drum over its firebox, and the cooling tray beside it.
1. The fire: right-click with wood, coal or any fuel, then a flint and steel to light it.
2. The hopper: right-click with green coffee, four handfuls at a time, eight at most.
3. Charging: empty hand, right-click pulls the slide. It needs at least 180 °C.
4. Roasting: green, yellow, then brown. At first crack (half a minute), light; between the cracks, medium; past second crack, dark. Too long and it burns, the chimney smokes black. Empty hand, right-click: the trier tells you how far the beans are.
5. Discharging: crouch with an empty hand to open the door (not before first crack).
6. The tray: the beans steam for about ten seconds, then right-click the tray to take them.