Anyone need to replace the original plastic tubing connection on their Makerfarm? I created a parametric coupler in openscad after having to change a dimension on the one I was using on the Mostly Printed CNC project. There are lots of variables you can adjust & this can also be opened in the thingiverse customizer. I made one of the STL files a 5mm to 5mm which should fit on the standard Makerfarm i3v machines. You can also make it in 2 halves in case you do not want to take the machine apart to install it. The 2 halves requires 2 more bolts & nuts.

http://www.thingiverse.com/thing:964680