Lava from Blast furnaces

Ever find yourself annoyed by limited supplies in a survival challenge such as Skyblocks preventing you from ever reaching the Nether much less the End? Are you simply looking for a way to keep that slimeblock obsidian 3D printer you've always wanted to build automatically stocked? Well here's a relatively balanced solution! Obsidian, basalt, and stone should be able to be heated up in a blast furnace for a long time using a lot of energy in fuel in order to create lava. The lava should be removable using either a bucket in a powered dispenser or a handheld bucket. The Obsidian should be included simply because it makes sense. Some would claim that it is OP to have an essentially infinite source of lava since it is such a powerful fuel which is ridiculous considering that logically it would take at least slightly more energy in terms of fuel to make the lava then could be derived from the lava.