Greetings, dear engineerkin. I recently read a suggestion by Leadfootslim about mechanical bellows (Mechanical Bellows (For Steel and/or faster Furnaces)) and thought: Why stop there? So I spent several hours of drawing and researching, and this is the result: Some further details: Unlike the regular furnace, the blast furnace is a large grid multiblock structure similar to long slopes or large round walls, two blocks for the actual furnace and one at the side for the channel. It should be the only method to produce steel, like the forge is the only way to process it. Apart from that, it should have a slightly higher output than the regular furnace. It can run without the powered bellows, but is much slower without it (maybe even a tad slower than the regular furnace), and has a lower item capacity. This means you can research and produce steel items without having to have researched advanced mechanics first. The bellows should be able to be placed on all the remaining sides of the bottom part. Instead of directly outputting its pruducts inside its UI, it just smelts the inputted ores, tools and ingots until they are liquid (only one type of metal at a time!) As soon as the wished metal is molten, you can open the lid (or whatever you call it) to the channel by activating it. A little animation plays, with the lid shifting upwards, a "sausage" of molten metal appearing for a time equivalating the amount of metal that is required to fill the mould (simulating flowing metal), and the lid closing after the metal sausage has disappeared. If there is molten metal inside, it constantly needs to be heated. If the fire goes out too soon, the metal becomes hard again after a short time and the blast furnace is rendered useless until it gets properly fired again. Because of that, it should have a bigger fuel capacity than other fueled devices. While a fire is lit inside the furnace, smoke emerges from the top. The small grid moulds can be crafted at the regular crafting station with clay and the item you want as an output, e.g. one or more ingots, with a maximum of eight ingots per mould or so. After that, they're hardened at the kiln. They can simply be placed exactly below the blast furnaces channel, and have a take-only inventory. The large grid moulds however are directly build underneath the channel, using clay, dirt, and a (wax)model of the workpiece. The model is created at a special modeling table. Creating the large moulds and the modeling table need to be researched after the Advanced Mechanics research (because without the bellows, you won't even be able to smelt a sufficient amount of metal). After the mould has been filled, the workpiece can be retrieved by deconstructing the mould. I hope you take adding the mentioned mechanics to the game into consideration, I put much time, love and effort in this thread.