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BED Temp Layer Option
Under Filament Settings there is the First layer Bed temp setting and all other Bed Layer temp setting. I would like to see the First Layer temp option changed to a dialog box where I can enter how many layers starting from the First Layer I want to heat at a given temp. I can do this in Simplify3D or at least I can for the fan speed. I am trying to get the second layer to stick to the first layer. Usually I just raise the overall temp of the bed for the whole print.
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So, you can approximate this with conditional gcode and gcode math in Slic3r.
Edit the before-layer GCode window and check for the layer number (or Z height) to insert M140 calls. Additionally, you can do math to get a delta between the First Layer bed temp and other-layer bed temp.
The other thing to remember is that it usually takes minutes for the bed to cool down to the Bed Temp.