Surface with problems

[Corrado1 0]

As always I apologize for my English.
However, I ask that you write to me in English.
I attach photos and profiles of these caps printed in PETG.
The surface at the top has regular roughnesses which if you try to remove with abrasive paper do not disappear because they also persist on the inside.
If you enlarge the image in the slicer as much as possible, it appears that there is a uniform space between the filaments.
If I load the same object with a PLA profile the gap seems to disappear. I checked and the TOP/BOTTOM settings seem to match.
The problem is that with these grooves it becomes almost impossible to paint the object as the paint penetrates the cracks.
Thanks for your help

EN3MAX_PIASTRA AERAZIONE SENZA LOGO.3mf

[Slashee_the_Cow 621]

The problem is that PETG is sort of stringy compared to PLA so instead of oozing out a bit after it comes out of the nozzle it just gets laid down in the line it was printed.

 

A couple of suggestions:

Turn on Top/Bottom > Enable Ironing and then make Iron Only Highest Layer (it'll appear when you enable ironing) is turned off. Ironing runs the nozzle over a surface letting out a small trickle designed to fill any gaps.

Increase Material > Top/Bottom Flow. I haven't tried this so I wouldn't know what value you'd want but 110% might be a good place to start. This will extrude more material than is needed to print the line which hopefully might expand and fill the gaps.

[Corrado1 0]

CIAO! Come al solito risolvi tutti i miei problemi!
Per fortuna ti ho incontrato!
Ho seguito entrambi i vostri consigli e questo è il risultato (allego foto).
Sono veramente felice!
Il problema adesso rimane solo il viso a contatto con i supporti che è veramente brutto.
Riscontro lo stesso problema anche con il PLA ma in una forma minore.
In entrambi i casi il supporto è un po' difficile da rimuovere ma la superficie di contatto risulta poco stampata anche prima di rimuovere i supporti.
Allego foto e profilo aggiornato con i vostri ultimi suggerimenti.

MILLE GRAZIE

profilo.3mf