scaleside

local top = 51
local bottom = 46
local width = 63

local function refuel()
    if turtle.getFuelLevel() == 0 then
        local prev = turtle.getSelectedSlot()
        turtle.select(1)
        if not turtle.refuel(1) then
            print('Need more fuel')
            while not turtle.refuel(1) do
                sleep(1)
            end
        end
        turtle.select(prev)
    end
end

local function returnToFloor()
    turtle.turnRight()
    while not turtle.forward() do
        turtle.dig()
        sleep(.5)
    end
    turtle.turnLeft()
end

for i = 1, width, 1 do
    turtle.dig()

    for j = bottom + 1, top - 1, 1 do
        refuel()
        if i % 2 == 1 then
            turtle.up()
        else
            turtle.down()
        end
        turtle.dig()
    end
    returnToFloor()
end