This shows my vertical 2 stage compost bin. Perhaps it is a new design. Anyway, it has 2 main advantages over the 2 stage side by side compost bins.
1 The fresh compost is high up so gets more heat from the sun to rot faster.
2 When you move material from the top bin to the bottom, there is no great effort, it just falls down!
With the other type, you must do a lot more work to achieve the same end result.
I also show a method to reduce woody material in size.
It is the most effective and easy way I have found so far.