Is it possible in "CuraEngine Settings" in "G-codes" to insert in addition to Start and End G-code "Before layer change G-code"? I would like when using CuraEngine to be able to change some of the print parameters for certain layers. For example "Flow Percentage" M221 S50 from the first to the third layer.
BTW: Flow 50% for first layer is normally a very bad idea. If you really need this your z homing is probably wrong and bed too close to printer.