Reply To: Thin white line at bottom of projection between layer prints.

Did you check if your screen resolution for second monitor(acer projector) is 1920:1080?
Aren’t these lines present in images generated by the slicer?
Mean while, it’s recommended to use solid black wallpaper to avoid problems if something wrong happens.
About turning on/off the projector, you probably have a wrong COM port in configuration (note there’s one for the arduino, other for the projector)
Check also connections, and in configs, if model =acer
Hope it helps