Captive portal to LAN routing

[blaise]

Hi,

I'm trying to solve this for some time now but i can't achieve it. So I ask here (I hope I'm in the right place)

I have the following setup:

LAN (on vlan0)
WAN (on physical interface)
WLAN (on vlan1)

I'm running a "Captive portal" on WLAN to provide Internet access to our visitors. Without any access to LAN.
But now I need to provide a printer to our visitor. The printer is in LAN network but visitors in WLAN.
I tried a 1:1 NAT but it does not work.

Is there any way to achieve this ?

Thanks a lot for your help !