This is a net pot for hydroponic gardening. I've used it to grow lettuce, basil, cilantro, and parsley and have not encountered any problems.
The part is split in two so it can be printed without supports while at the same time provide a clean finish on the top. To assemble the pot, just stick the two parts together and use suitable glue or a 3D-pen to bond them together.
It takes about an hour to print one of them on my printer (0.3 mm layer height). The pot is quite thin. So when cleaning the pots after the plant has been harvested, in case you're plants get bigger and develop strong roots, I'd advise being a bit careful while removing the roots. Otherwise, you might break some of the structures.
The pot is designed to be used in holes of about 56 mm, so the inner diameter of the rim is 55 mm. The outer diameter of the rim is 60 mm. To avoid the pot falling through the hole, do not use the pot with holes with a diameter of or greater than 60 mm.