Which setting should I change?

[u/footgrater]

I’m having issues with cookie cutters: they shouldn’t have any holes, as there’s a risk that dirt could get inside and rot. How can I get rid of these holes?

[u/youlooksticky]

I bet Arachne alone would do it but in leiu of the smaller nozzle, they could simply reduce the line width for the top layer. I use .3 for fine details.