I have a Harbor Freight "2HP" dust collector. I haven't fully integrated it with ducting and a permanent housing yet, but I've made some modifications such as a Thein baffle and a 55 gallon drum for chip collection. I'm venting outside, so don't need a fancy filter.
In my research, I've seen a lot of talk about upgrading the impeller with the Rikon part number P60-200-22. It's a 12" impeller with reverse vanes while the stock HF impeller is 10" with forward vanes. But, it's out of stock for 3 more months and costs $120 (plus shipping). I'm cheap and don't want to pay that much. That's why I bought a Harbor Freight unit to begin with and I didn't pay much more than that for the whole dust collector.
I've watched several videos, particularly from Matthias Wandel, regarding shop-built impellers. I'm just wondering if anyone has built their own impeller for the HF dust collector and what kind of success or failure they had or if there were any lessons learned to be shared?