Did your workstations print directly to the IP of the printer (you can view in the port properties). If yes, then go into DHCP, set a reservation based on the mac address of your printer (you can find out by printing a config page on the printer). That way, you don't have to change it on every workstation (I suppose you don't use a printserver or shared printer from the server) and you avoid having any problems in the future.
I usually reserve a batch of 10 IPs for servers, then 10 IPs for printers in small sized businesses, a few IPs for VPN connections, 2 for firewalls/gateways, a few just as spare and the rest for DHCP clients.