gistfile1.lua

minetest.register_craftitem("needbees:frame_blitz", {
  inventory_image = "frame_blitz.png",
  on_use = function(itemstack, user, pointed_thing)
	local md = tonumber(itemstack:get_metadata()) or 0

	md = md + 1
	
	itemstack:set_metadata(md .. "")
	
	print(itemstack:get_metadata()) -- Always prints '1'?
  
  end
})