An excellent, low cost, solution to your dust seperation issues.  Prior to purchasing this 2-stage cyclone seperator I could only vacuum fine dust and debris from my wood shop.  Larger bits of debris would forcefully get sucked into the fan blades of the DC blower and bang around before shooting out of the back side into the dust bag.  I feared that my DC blower would get damaged from this so I sought out to purchase or build a seperator.  I have a small shop, approximately 13' x 10', and a standard 50 Gallon seperator, although idea, would be too large for my space.  This seperator fits onto a 5-Gallon hardware store bucket, which I already owned several of.  It takes up only 1 sq ft of floor space and I can easily suspend it, tuck it away or move it with out any issues.  The only concerns I have are that the lid does not "snap-on" to the bucket and does not have a tight fit.  I fixed this by running a couple of layers of plastic/vinyl tape (any wide, flexible tape would work, i.e. duct tape) around the rim of the bucket, now the lid fits securely.  The 5-gallon bucket handle fits tightly over the seperator to help hold it in place.  Additionally once the DC is running the Suction pulls the seperator tight against the bucket too.  Lastly the 2 1/2" ports don't securly hold in place the hoses, i had to add tape to the end of my hose connectors in order to create a tight friction fit into the ports.