Yup, I echo this. I built one about 6 months ago. Where I live the pellet quality is all over the map. I had a spare shopvac so I just dedicated it to this use. My old Austroflamm wasn't too picky about what I put in it, would burn it, fines and all. The new stove however is WAY different. It's fussy about not getting fines, plus the slot to the hopper is smaller than your hand so vacuuming out the fines is nearly impossible. I figured it's easier to just feed it clean fuel. I don't mind cleaning a few bags at a time, I just fill 5-gallon buckets and tote inside as necessary. Now I buy my fuel by the ton, as the weather can be really unpredictable and if we're 'iced in' then it's tough to get to the feed store for a few bags of pellets. But a lot of the fines in the bags comes from handling. Sometimes the handling equipment at the mill (and the kids at the feed store) can bust up the pellets and create a lot of fines. I built mine out of ABS; PVC in those sizes is rare around here as it's against local codes to use it for drain and waste. I spent about $90 on the whole thing and will be sharing the plans with my brother in law to help relieve the cost a bit. One thing I noticed: You have to be careful about how fast you feed it. Mine seems to want to have some air rushing past the pellets as they are being fed. If I just fill the infeed, then it wants to clog and the shopvac will suck the pellets straight through. Then I have to open the shopvac and scoop 'em out. I do that anyway periodically; I just throw the whole mess, pellets and dust, into a bucket and feed it through again. Presto- pellets recovered. I also noticed that if I had a bag of pellets that had gotten wet (like from me using them for ballast in the pickup) that once they'd dried out, I could bang the bag around to break up the marginal pellets, then run them through the machine to suck up the ones that had broken completely down. Hope this helps clarify a bit.