1) The panel on the left side must be removed prior to each roasting session. Of course dry process beans in particular shed an excess amount of chaff. The chaff gathers quite quickly inside the machine and if you’re not on top of it, you’ll see tiny wisps of smoke and tiny chaff fires inside the machine. I do not believe there is enough air inside the machine to let a fire go uncontrolled. If so, by accident, I’d have had a melt down already. 2) Even though you clean the chaff collector after every roast, the screen will still become clogged. I have actually had to rinse mine in water to be able to get out particulate matter that just sticks in there. This collector must be kept very clean for it to work at any kind of good efficiency. 3) Surely the chaff collector being clogged has something to do with how rapidly the buildup of chaff inside the roaster occurs. This has another ramification. The chaff collector becomes clogged and stops collecting chaff. So where does it go? It gets sucked up by the squirrel cage fan and gets exhausted. Not too bad a thing right? Wrong, that fan gets clogged too. Now, you’re roast profiles are changing, you’re smelling smoke and you are seeing those wisps of smoke more often. You are vigilant in cleaning the chaff collector so you feel safe. After removing the collector I inspect the fan inside. Admittedly, I did not recall what the fan looked like initially. After removing the ducting from the back, I look at the fan. I get a plastic fork and poke at the fan from the exhaust side. It becomes apparent that that is a metal fan. I look inside from the collector side and see a big solid color of chaff. I thought that the parts were kind of just coated, but the reality it that this fan is completely clogged. No doubt, the chaff has not been escaping at all, and just been collecting inside the roaster. It took several plastic fork efforts from the inside of the fan and outside to clean it back to what it must have originally looked like. Much debris was removed. 4) Ever since these cleanings my roasts have returned to normal. I get chaff in the chaff collector and the amount of chaff inside the machine has greatly reduced. HR-1 owners be careful and watch for this. The manual says to clean regularly for a reason. Take care.