Replacement seed pod or "Grow Basket" for AeroGarden hydroponic systems. More like the original baskets, these should fit easily with both the garden and the "Grow Dome" caps.
I printed with Maker Geeks Food Safe PLA just because: http://www.makergeeks.com/fosafdapla11.html
Print with the brim-side down, with or without a raft, and with a thick shell (it's mainly shell). No supports necessary.