This is a dust shoe for the Makita RT070x series of palm routers. 1.25" vacuum connection.
Two piece construction using magnets allows quick tool change.
Redirection of cooling air to prevent blowing on work surface.
Rubber brush easily replaced for different work depths (or can print extra bottoms for quick swap).
Designed to be printed without supports.
To complete, you will need six 6mm x 3mm magnets, two 8mm x 3mm magnets, two 260mm x 30mm+ (10.25 x 2 inch) strips of 1/16 inch rubber (tire inner-tube works well), and one 1" x 2" piece of 0.6mm lexan (or some durable clear plastic from packaging). Optionally, you may need 6-12 #2 sheet metal screws.
Update 1-3-2018: The set-screws for holding the shoe to the Makita didn't work well for me, so I cut slots in the position where the current holes are and used a 3-inch stainless steel clamp. That worked great, so I've provided a new file for the upper part of the shoe to incorporate that change.