It was only 40g roasted, but it was the most exciting roast Ive done! Have learned enough from that roast to plan a more precise and well constructed version, and have possibly got a non-electronic solution to controlling the airflow
Now I just need a couple more heat gun fans...

I basically modelled my "next" on those - to solve the excess elevation of the lighter beans I think a simpler solution is to have a longer "tube" they can fly up.
and you probably want there to be a minimum airflow to keep the heat down. As you reduce the airflow to stop the lovely bean fountain, youll start to blow hotter air (the PID control loop will deal with this to a certain extent - so it isnt necessarily fatal). The gain constants in your PID loop are supposed to be constants - the thing is tuned to a particular heat transfer function if you like. So futzing with the airflow will screw around with this to a certain extent.
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