The questions Artellos asked would be of help in assisting you for sure. You'll need to turn on File and Printer sharing for your computers. And share the printer out from your desktop.
From control panel go to devices and printers, right click your printer and choose printer properties. Go to the sharing tab. Check share this printer, and give it a share name.
If your sharing is set up correctly when you go to add a printer to the laptops choose Select a shared printer by name and browse (Network discovery needs to be enabled to see it listed here). You'll see your desktop computer name in there and under that your printer.
If you don't see it or have network discovery off you can type in the address manually using the example below.
You'll need the \\NAMEOFTHEDESKTOP\SHAREDNAMEOFPRINTER and you'll be asked for your logon credentials of the PC it's hard wired too unless you don't have a password.