flowerSoft requires the use of laser printers that are not host-based.
From the links below make sure the printer you select has an N under the host-based column and is capable of understanding the PCL-5e or PCL-5c languange.
Brother Printers
http://www-01.ibm.com/support/docview.wss?uid=nas1d1817a5251ba1e4b862569c100799559
Canon Printers
http://www-01.ibm.com/support/docview.wss?uid=nas1e9bd60440bf30f3c862569c100795cad
Dell Printers
http://www-01.ibm.com/support/docview.wss?uid=nas17997c91965ada7fc86256d43005680a0
Epson Printers
http://www-01.ibm.com/support/docview.wss?uid=nas1aeb8bc2140732fb2862569c10078efbb
HP Printers
HP Printers
Konica Printers
http://www-01.ibm.com/support/docview.wss?uid=nas14b2576f82af70d80862569c1007a491d
Lexmark Printers
Lexmark Printers
Okidata Printers
http://www-01.ibm.com/support/docview.wss?uid=nas14e596d0940ce1af1862569c100790da8
Ricoh Printers
http://www-01.ibm.com/support/docview.wss?uid=nas14fc8b55774312b49862569c1007aa2ff
Toshiba Printers
http://www-01.ibm.com/support/docview.wss?uid=nas1c9dcd23db09b78b1862569c1007865cb
For other brands please refer to:
http://www-01.ibm.com/support/docview.wss?uid=nas1b44a2cf4ba778d83862568250053649f