PRINTER SHARING THROUGH A WIRELESS ROUTER, AND A COMCAST ROUTER

Question for all you network techies out there:

I have a small network I’m trying to share a printer on. I have comcast cable coming in–immediately connected to a comcast router–which then connects to my main desktop pc and also to my wireless netgear router. The printer is hardwired to the main desktop pc. The pc’s I want to share with are connected to the network via the wireless router.

How do I connect my laptop (networked thru the wireless router) to the printer? [requires: laptop–>wireless router–>comcast router–>main desktop–>printer] THANKS!