You can cycle the lease time by temporarily reducing it to 2 mins. Waiting 4-5 minutes and see if the 0.0.0.0 goes away, that’s not a normal DHCP IP. Then return the lease time to 1 day.
Network>Network Settings>Lease Time
Also on the client list it may show all the old clients that were connected recently / last 24 hours - select online clients only and verify there is no 0.0.0.0 client connected - ever.
Maybe the 3D printer’s network client is malfunctioning or something. Maybe see if you can update the 3D printers firmware?