I Remixed the "Airtripper Base with Smaller Mounting Hole For Mini Kossel" (http://www.thingiverse.com/thing:603801) to allow me to drill and tap my own push-fit fitting.
I have not yet printed / used this, so PLEASE, if you print this, let me know how it works out for you. The only modification I did was to close off the end so that I can drill and tap for a tight fitting push-fit connector.
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