Here's a couple of pictures of the dust shoe...



Click image for larger version.  Name: dust shoe.jpg  Views: 3165  Size: 98.6 KB  ID: 12245Click image for larger version.  Name: cnc dust shoe.jpg  Views: 1461  Size: 41.8 KB  ID: 12246

From the sketchup image you can see the shoe is in two parts which I just simply glued together. I can easy just pull the shoe off when changing bits as it just clips into the arms either side.

For my PCB milling it works great as it is, but when milling acrylic you still get the odd piece flying out. I think a suitable skirt will solve that, but I don't want to use brushes, I think I would rather something clear so I can see whats going on. I also think if I wanted to be rally clever I could add some LED lights to it as well, or maybe just print it in clear PLA.