public PXAction<SOShipment> printLabelsToStation;
[PXButton(CommitChanges = true)]
[PXUIField(DisplayName = "Print Labels To Station")]
public virtual IEnumerable PrintLabelsToStation(PXAdapter adapter)
{
	var shipmentGraph = adapter.View.Graph as SOShipmentEntry;
	SOShipment shipment = shipmentGraph.Document.Current;
	if (shipment is null) return adapter.Get();

	Guid? printerID = // get printerID
	if (printerID is null)
		throw new PXException("No packing station printer has been selected");

	PXLongOperation.StartOperation(shipmentGraph, delegate ()
	{
		SMPrintJobMaint printGraph = PXGraph.CreateInstance<SMPrintJobMaint>();

        var reportParams = new Dictionary<string, string>();

        var printSettings = new PrintSettings
        {
            PrintWithDeviceHub = true,
            DefinePrinterManually = true
            PrinterID = printerID,
            NumberOfCopies = 1
        };

        printGraph.AddPrintJob($"Label for x", printSettings, (string)null, reportParams, null);
	});

	return adapter.Get();
}

Understand, this is by no means a working code block.

EDIT: just realized you may not be looking for code

Thanks, do I have to put this in to a customization? how to do that?

There may be a way to do it without customization. If you weren't asking for a customization, disregard that answer. It would take more expertise and context.

Hi @alistair were you able to find a solution? Thank you!