View difference between Paste ID: 1yLvWnmg and gSDftGxU

 local function checkFuel( )
 	write("Checking fuel level...")
 	if turtle.getFuelLevel() < 20 then
 		print("need refuel.")
 		for i=1,16 do
 			turtle.select(i)
 			if turtle.refuel(turtle.getItemCount(i)) then
 				write("Fueled from slot ")
 				print(i)
 			end
 
 			if turtle.getFuelLevel() >= 500 then
 				return
 			end
 
 		end
 	else
 		print("fuel status is ok.")
 	end
 end
 
 local function goToGround( )
 	write("goToGround...")
 	while turtle.detectDown() == false do
 		turtle.down()
 	end
 	print("ok")
 end
 
 local function makeCorridoor( length )
 	goToGround()
 	write("makeCorridoor")
 
-	for i=1,length,1 do
+	for i=0,length do
 		write(".");
 		turtle.dig()
 		turtle.down()
 		turtle.dig()
 		turtle.up()
 		turtle.forward()
 	end
 	print("done")
 end
 
 local function makeCorridoorReturn( length )
 	makeCorridoor(length)
 
-	for i=1,length,1 do
+	for i=0,length do
 		turtle.back()
 	end
 end
 
 local function makeMatrix( rows, cols )
 	local coord, size
 	coord = {}
 	size  = {}
 
 	coord.x = 0
 	coord.y = 0
 
 	size.x  = 2 * rows + 1
 	size.y  = 2 * cols + 1
 
 	print("Cols...")
 	for i=1,cols,1 do
 		checkFuel()
 		write("i=")
 		print(i)
 		makeCorridoorReturn( size.x )
 
 		turtle.turnRight()
-		makeCorridoor(2)
+		makeCorridoor(3)
 		turtle.turnLeft()
 	end
 
 	turtle.turnRight()
 	turtle.turnRight()
 
 	for i=0,size.y,1 do
 		turtle.forward()
 	end
 
 	turtle.turnRight()
 
 	print("Rows...")
 	for i=1,rows,1 do
 		checkFuel()
 		write("i=")
 		print(i)
 		makeCorridoorReturn( size.y )
 
 		turtle.turnLeft()
-		makeCorridoor(2)
+		makeCorridoor(3)
 		turtle.turnRight()
 	end
 end
 
-makeMatrix( 10, 10 )
+makeMatrix( 6, 6 )