diff --git a/homeassistant/components/dremel_3d_printer/entity.py b/homeassistant/components/dremel_3d_printer/entity.py
index 46686e47e1f..c2823e594a8 100644
--- a/homeassistant/components/dremel_3d_printer/entity.py
+++ b/homeassistant/components/dremel_3d_printer/entity.py
@@ -30,6 +30,7 @@ class Dremel3DPrinterEntity(CoordinatorEntity[Dremel3DPrinterDataUpdateCoordinat
         """Return device information about this Dremel printer."""
         return DeviceInfo(
             identifiers={(DOMAIN, self._api.get_serial_number())},
+            serial_number=self._api.get_serial_number(),
             manufacturer=self._api.get_manufacturer(),
             model=self._api.get_model(),
             name=self._api.get_title(),