Just my two cents on the cleaning the hopper and auger of dust question. Most of my career I was active in agriculture, as a farmer, then as a nutritionist for primarily hog, beef, and dairy production, and later as an agronomist and crop consultant. Over my career I have a lot of experience with augers moving loose, shelled grains (think pellet dust) and corn on the cob grains (think pellets). Whenever switching from one loose grain to another where contamination might be an issue (shelled corn to soybeans), they would flush the auger (think pellet dust) with corn cobs (think pellets).
The recommendation from recteq that one must purge the auger of pellet dust by letting the hopper run dry of pellets is completely unfounded. The dust will be purged from the auger naturally as pellets force the dust out of the auger. I’ve had my RT-700 for over three years now, have shared here how I have burned thousands of pounds of pellets in it, and I have never cleansed the hopper or anger once.