Produces tree trunks out of 2 unprocessed wood. Necessary to make arrows for arrow towers.
- You should keep these 2-3 levels lower than your base.
- Only upgrade them if you see your supply is full but need more arrows.
- Keeping them the same level as your other industry helps keep resources filled.
- These are a low priority for upgrading. You should only upgrade these if your arrow supply is running low.
- Keep them 1-2 levels higher than your Harvesters.
- don't forget to upgrade steel factories to the same level, to keep arrow production steady.
- Put these and steel factories near the arrow factory as you get the same amount of sawmills, steel factories, and arrow factories in one level. (To boost production)
Characteristics at different levels
 original reference