I thought I'd share some photos of my duct collector. Basically it's a RIDGID DC4-1, with several mods, connected to a Thien-design separator. Or, as I refer to it, a pimped-out trashcan
It works beyond my expectations, barely any dust now gets to the bag. Some features:
Shortened 5" pipe between the blower and bag assy
Smooth walled pipe between the blower and bag assy
Thien Separator
Polished surfaces in the separator
Raised trashcan to make it easy to empty - the bag was a pain.
Weatherstrip around the circumference of the lid - perfect seal
Next up will be either a Wynn filter (the skinny one, bigger surface area), or possibly just exterior vent, the Thien works so well.