This is a mesh pot that can be printed without any supports and constructed using the MakerGrid clips. The top has clip holders which you can use to combine it with other parts from the MakerGrid, see also: Maker Grid Base Parts

I made it to be put directly into an Eurobox. You don't need to drill a round hole, but can just use a jig saw to make the rectangular hole.

You print the bottom part once and the side walls 4 times. You will need at least 12 of the clips. 8 for the bottom and 4 for the top. To mount it to the Eurobox lid I recommend zipties.