Buffers are used to store material at various points in the process being modeled.

Buffer Icon
The Buffer node can represent:
- starting material
- ending produced material
- in-process surge or buffer
When you build a model, the links section should always start and end with Buffers.
Beginning Buffers typically are the starting node of the structure. Beginning Buffers typically have a large Capacity & Initial Level representing the amount of material available.
Ending Buffers typically are the ending node of the structure. Ending Buffers typically have a large (or infinite) Capacity with the Initial Level set to 0.