endless_dungeon/mods/glue/init.lua

local nodes={"default:sandstone","default:silver_sandstone","default:desert_sandstone"}
for fi=1,#nodes,1 do
	minetest.register_craft(
		{
			type="shaped",
			output="default:furnace",
			recipe={
				{nodes[fi], nodes[fi], nodes[fi]},
				{nodes[fi], "", nodes[fi]},
				{nodes[fi], nodes[fi], nodes[fi]},
		}
	}
)
end