@Noobie86
Hi, welcome to our community.
May I confirm some information to understand your situation better?
1. What is your exact network topology? How is the unmanaged switch connected? How are the Deco units are connected to each other?
2. What is your model of your switch? What are the models of your network printers?
3. Please connect your printer one Deco directly via Ethernet cable to confirm whether it can work.
4. Please try different port on your switch and try different Ethernet cable.
5. Confirm if your printer has a static IP address or not. If so, change the IP settings on the printer to obtain an IP address automatically.
Thank you and best regards.