I've noticed a few Dust Extraction queries in this forum, so here's the solution that I've used for my CNC Router which may give others a few ideas.
2 pieces of MDF $8.00
3 M8 Threaded Rod $6.00
9 M8 Nuts & Washers $2.00
20 Litre Plastic Bucket Free
Recycled Truck Air Filter Free
Recycled Extractor fan from a Computer Mainframe $25.00
100mm Flexible Ventilation Ducting $10.00
4 Castors (optional) Free
Total Cost $51.00 NZ Dollars
The photo is fairly self explanatory - The Extractor Fan sucks dust & chips from the Router Skirt and blows them into the bucket with the Air Filter allowing the Extracted Air to escape - this thing SUCKS ! !