I'm looking for some input on how to think about how hot to have the bed. I started out just following what I read on the internet for various materials. Then I started to think that the bed heat should be something close to Tg for the material. Now I'm not so sure. For me, so many problems are fixed by having a good first layer and I've got that down to a fine art now. But you can still have some issues later if the material pulls away from the bed. Some of those is about understanding the model, and using infill in such a way as to not set up crazy internal stresses. But I'm wondering if some of it might also be about having the bed temp right. Looking through some of the settings people are using with aluminium bed, I noticed that some use a different bed temp after the first layer. So I'm curious to understand why that might help. A clear place it helps is in the speed to return to cool-enough-to-pop-the-part-off. But I'm also wondering if it can help with keeping the base flat. I'm beginning to think that while Tg might be good for first layer adhesion, we actually might not want such a malleable material at the point those stresses begin to grow. If the material is less malleable, perhaps it won't bend, and such issues might be reduced. So at this point the question turns to what temp you need to stay stuck to the bed and that will again vary depending on the bed material, the adhesion used, and the material printed. Anyone with any cunning observations / knowledge in this area?