I would also very much like to be able to communicate directly with my printer from S3D. I have a Qidi X-Plus and currently I have to save the gcode from S3D then use the original Qidi control panel to move the file to the printer (defined by IP address) and tell it to 'Print'.
It works, but it's tedious, and to not have this facility is a very poor show for a piece of software that is (a) so highly recommended and (b) paid for.
Most of the time I'm not interested in sending commands directly to the printer, so for me, having a way to send the file to the printer then tell it to 'print' in one step from S3D would be sufficient.
Can you post an update on this request please? It seems it's been outstanding for years now.