I use a Windows box as a print server for my home network. I first installed the PrinterShare service on this box. Then, I installed the app on my iPhone. Next, I selected a photo from my iPhone roll and printed to my HP Photosmart color printer using 4x6 photo paper. Default margin on PrinterShare app was too large (~0.8"). Reduced margins and the next picture turned out perfect! Now its super convenient, especially for my 14 year old daughter who prints out tons of pictures of her friends taken with her own iPhone.