EnderTurtlePlacer

-- Fill the whole turtle with 64 stacks of fences. Refuel.
-- Place it anywhere (high above lands is prefered, but anything is possible besides bedrock)
local stackProgress = 1
local site = 1
local currentStack = 1
local stackSize = 1

-- outer while loop. 4 times (1 for each side of the square)
while (site < 5) do
 stackProgress = 1
 -- side while loop. 4 times (1 for each stack of fences for this side)
 while (stackProgress < 5) do
  stackSize = 1
  -- stack while loop. 64 times (1 for each fence of the stack)
  while (stackSize < 65) do
   -- gravel/sand detection
   while turtle.detect() do
    turtle.dig()
    sleep(0.25)
   end
   turtle.forward()
   turtle.select(currentStack)
   turtle.digDown()
   turtle.placeDown()
   stackSize= stackSize + 1
  end
  stackProgress = stackProgress + 1
  currentStack = currentStack + 1
 end
 turtle.turnLeft()
 site = site + 1
end