A concept. Discuss. I've been doing a bit of research into a larger heatbed recently with a view to creating a really large format (1m x 1m x 1m minimum), printer with a low enough current draw for the heat bed. From what I can tell, currently, large print beds have fairly massive current draws when using things like kapton/pcb/silicon heat beds. However, I think I have a theory for making a large one with much lower current draws. My current printer uses 4 x power resistors to heat a 2mm aluminium print bed, and it does require quite a bit of power. Firstly, I'm taking this concept PURELY as a heatbed, without considering how it would be applied to X, Y and Z motion. Now, as far as the bed goes, what if we considered liquid heating. I know there's liquid cooling knocking about, but liquid heating is used in architecture quite a bit, and it can be quite efficient. The idea is to heat liquid in a reservoir and pump it through an aluminium print bed in order to heat it. But, in order for this to work efficiently, you need a number of things: 1. A liquid that doesn't turn to gas below approx 150 degrees. 2. One with a considerably lower specific heat capacity than water (ie., one that doesn't need as much energy as water to get hot). 3. One which is not corrosive. 4. One which is not toxic. I don't know enough about chemistry to pick a liquid, but it does seem to me that this could be done.... I think! Even with water, you could heat it to about 90 degrees without it turning to steam, but it does need quite a bit of energy, and keeping it hot over the length of time of a long print could be just as much energy use as a normal heat bed. In anycase, it's a concept. Anyone have any ideas on it?