Thanks for all the quick response!
@Daid: sorry, i didn't want to hurt your ears I just thought it would make it easier to get a quick overview...
I'm not into the code of Cura... but i'd appreciate you saving this idea for a later time, when you have to touch the part of code anyway.
Until then ... would it be senseful and is it possible to change the Controller-FW, so that tuning the fan speed over the menu is not allways overwritten by the next gcode setting, but to make it a percental tuning value for the gcode values over the whole rest of the print? This would give us a "manual" way to partly solve the solid/bridging problem.
@gr5: Thank you for the link, i've read this before and agree that temp is the major factor, but, when printing solid parts that need to be as rigid as possible, high temp is important for best possible adhesion/merging of the layers, so because you can't change the temp rapidly while bridging, changing fan speed is the only way i see...
@all: any other ideas to solve this?