When you have several objects on a plate (using different filaments) and you select PRINT BY OBJECT and check Flow Dynamics Calibration in the Send print job to dialog, it seems that it only does Flow Dynamics Calibration for the first filament used. Or at least it only displays the message saying it’s doing Flow Calibration for the first filament. When it switches objects, it purges the old filament and loads the new one but never displays the Flow Dynamics Calibration message again. It may be doing it but gives no messages. Not sure how to find out if it did do the calibration or if this is a possible bug.
Also I’d assume that Flow Dynamics Calibration should be different for each filament used but not 100% sure exactly what the A1 is doing during the calibration run. If anyone knows the details, please share.