The tall one is 12" and was Printed on a Wanhao Duplicator 5S, the short one can be printed on a Replicator.
Both fit standard 2.5" vac hose. Surprisingly the short one works almost as good as the tall one. They remove well over 99% .
Seen used with my Mostly Printed CNC here: https://www.youtube.com/watch?v=oAiwFX6CqRw
Update 01-28-2016: Added vac seps with no support.
.2 layer, 95% fill.
Suggest reinforcing the inlet so it does not split. Could use a printed sleeve, hose clamp or duct tape.