Perhaps use the LAN settings only. Setup a VLAN Guest like vlan 5 and don't allow inter-vlan routing. Then do a Port to VLAN assignment, for lets say port 4 and only assign VLAN 5 Access to that port, Then give the same VLAN 5 to your Guest SSID. This should allow the Guest network to talk with each other, and the Internet, while blocking them from talking to your other VLAN's.
If we tried to configure the SA with 2 vlans one for Data one for Guest, disable inter-vlan routing so the two can't talk. As long as the printer is wired not wireless we can set that on the DMZ port then setup ACL rules to control what can talk to the printer.
If the printer is Wireless there is no configuration I can think of to over come this limitation other than getting a different hardware solution.
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