Aerogarden Compatible Grow Insert

(Note, someone else pulled together a really nice replacement cup here http://www.thingiverse.com/thing:1863728 Consider using it instead. It is a much cleaner design!)

I'm gradually transitioning from the Aerogarden based hydroponic/aeroponic based gardening system to building my own. The first step was to replace the Aeroponic grow pods with larger pods that provide for more root growth and can be used with "rockwool" or other similar growing medium.

These pods are a better design than