Been trying for the past month to print this model, the base printed fine, but I'm getting the same errors in multiple slicers for the top part of the model, and I have had this confirmed by other people that the brick-type patterns on the top of the sewer lid are not connected and showing as floating regions, the pattarn is seperated from the object and 3D builder software also confirmed this. I have printed multiple angles and tried with supports, but as soon as I remove the tiny supports from the brick patterns, those all come loose and fall off because they are not properly connected to the model. Certainly not printable in PLA using FDM printers in the model's current state. I think the creator needs to reinspect the original model and hopefully upload a fix.