Share Printer in my two networks - Time Capsule

Possible, yes, but strictly speaking, not through the Guest network. This is an excerpt from About the Guest network feature of AirPort Extreme (3rd Generation or later), Time Capsule (2nd Generation or later), and AirPort Express 802.11n (2nd Generation)

If you want to give guests access to network features besides the Internet (such as AirPort printers, Time Capsule disk(s), AirPlay, or AirPort disks associated with your primary network), consider using the Add Wireless Client feature. This will allow clients to join the primary AirPort network either for a day or longer without requiring the password.

Guest Network is intended for Internet access only. All other devices on your network are inaccessible by design.

Apple uses VLAN to separate the Guest network from the Main or Production network. Technically speaking it is not possible for a Guest Network user to print to a printer in the Main network. But the same user can print to a printer added in the Guest network. The opposite is also true, a Main network user cannot have access to the Guest network printer.

Thank you