I play on a server with some friends and would like to set up an automatic tree farm. At the moment, is the best I can do. The only problem with this design is that it does not collect saplings as well. I have plenty of bonemeal from a skeleton spawner - so no problems there. I just need a way to make a tree farm that resupplies itself with saplings. Also, try and keep it light on redstone / pistons. We have a fair few resources, but they're not unlimited.