Vacuum Adapter
thingiverse
Update: I recommend version 2 at https://www.thingiverse.com/thing:3713421 Simple configurable vac adapter. Specify the diameter for both adapter ends, the end type (male or female), amount of taper (or none), and the wall thickness. update 6/10/19: Bug fix. Also added a slight taper on either end so the adapter can be pressed on tight. update 6/10/19: made taper amount adjustable on either end. update 6/20/19: added length adjuster
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