printing on not default printer / problem with size

Hello Everybody,

I've got a problem when I choose a printer with the properties
printerindex and printers of Tprinter. When the default printer has more
 pixels per inch the printer prints too big.
Can someone help me, or can someone tell me how to change the default
driver without using the tprintsetupdialog.

Thanks a lot
Andreas Sibbus

please email me at: