Large Seedling Grid & Pots

This started as a remix of [Seedling Grid and Pots](https://www.thingiverse.com/thing:4328182) by [Andy-ABTec](https://www.thingiverse.com/Andy-ABTec).

But, I made it bigger - inner size of the pot is 44x44x70 mm now. And I added a bottom for the grid, after that I removed inner walls in the grid. Because of size of printer's table I decreased count of cells in the grid