Hi,
I want to design a label containing variable fields with the ZebraDesigner tool. The designer force me to fill the variables when I try to print as described in the faq http://www.tek-tips.com/faqs.cfm?fid=2608

The result is a label like this
^XA~TA000~JSN^LT0^MMT^MNW^MTT^PON^PMN^LH0,0^JMA^PR4,4^MD0^JUS^LRN^CI0^XZ
^XA^LL0900
^PW1200
^FT460,650^A0N,58,57^FH\^FD21/07/08^FS
^FT381,340^A0N,58,57^FH\^FD123^FS
^BY4,2,251^FT1060,656^B2B,,Y,N
^FD0456^FS
^FT385,420^A0N,58,57^FH\^FD100^FS
^FT80,650^A0N,58,57^FH\^FDCurrent Date:^FS
^FT75,340^A0N,58,57^FH\^FDArticle No.:^FS
^FT77,121^A0N,58,57^FH\^FDZebraDesigner^FS
^FT80,418^A0N,58,57^FH\^FDCounter:^FS
^PQ1,0,1,Y^XZ

I want to force the ZebraDesigner creating ZPL2 code using ^DF (download format) and ^DFd:o.x (field number). After this the tool should send it to the barcode printer (StoredFormat). Later I'll to recall the label width ^XF.
In my opion the function File->Export to Printer should make this work but I get an error message: 'Terminal supports only prompted variables!'
 

The error message suggests you have some variable defined in your format that would not be available outside of ZDesigner, such as a Date field that ZDesigner would pull from the system.
Any fields defined as counter fields, database fields etc. will prevent export to printer function from working.

Check all variables and make sure they are defined as Keyboard Inputs and use printer fonts rather than True Types.
You can set the printer driver to print to file to produce the file containing ^DF if you need to see the output.