Modular Interlocking Windowsill Herb Pot

This is my design for a set of interlocking windowsill herb containers. I used some of my woodworking skills to sort out a dovetail joint system which fits tight enough to grip but still slides. I have yet to see a watertight print in PLA so you will have to apply a coating of epoxy on the inside. (http://www.amazon.com/Environmental-Technology-32-Ounce-Pour-On-Finish/dp/B000BZYYQ0/ref=sr_1_1?ie=UTF8&qid=1378490087&sr=8-1&keywords=epoxy+coating) Again I used the pause at Z feature to do the o