Sieve

The Sieve (pronounced siv) is a key component to starting your sky factory island. Right click on the sieve to add materials (Dirt, Gravel, Sand, or Dust) and then continue right clicking to filter the material. Dirt will drop stones that can be crafted into Cobblestone.

Meshes
In SkyFactory versions before SkyFactory 3, there is a single mesh type, called the Silk Mesh, which is crafted from 9 String.

o it does not matter once the Sieve is up. In SkyFactory 3, 9 String crafts a String Mesh, which is put into the Sieve after the Sieve is placed down.

Heavy Sieve
In SkyFactory 3, there is another Sieve, which accepts compressed blocks. It is crafted the same way as a normal Sieve, but with logs instead of planks. Compressed blocks can be created in a Crafting Table from 9 of the component block.