I heard about the rubber trees and I have an idea of another way of extrating them, its just another way of extrating rubber so i dont expect it be accpted. Well basicly you just attach rubber tubbing to the tree hole, and once you attache it it well begin draining the treesap and will bring it to some kind of storage container and will just store there, not much though D:
Recpies:
Rubber = o
space= .
Tubing
o o o
. . .
o o o
It will give you about 4 rubber so you wont be able to harvest every forest you see because that will be overpowered:D
Rubber tree tap storage container 
o o o
o . o
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