I'm surprised I didn't find anything like this already in the Thingiverse. This is a simple adapter that lets you connect tools directly to a vacuum cleaner extension hose, letting you use the extension like a regular hose.

Because this thing is fairly tall and has a small bed contact area, I have provided an anchor pad to increase the bed surface area. This reduces the possibility of the object coming loose while printing. Just snip it out when finished. It is easily commented out in the openscad file if you don't want that. All of the major dimensions are parameterized to allow for easy tweaking. Deafult height is 105 mm. but can be changed if desired.

Takes about 2 hours to print on my Printrbot+.