The plug is designed to cover holes made with a 30 mm pin drill.
The wall of the model is 0.7 mm. I print with a nozzle of 0.4 mm with a line width of 0.4 mm. Printing takes place in 2 walls.
In vase mode, I select the width of the lines - 0.6 mm. Both options work in my case. But in vase mode, you can only print 1 cap at a time.

By scaling the model along the x and y axes, I think it is possible to select the desired values ​​for other hole diameters.

Model in .f3d format attached

The outer diameter of the plug legs according to the project is 31 mm. The plugs I printed fit into the holes quite tightly. Perhaps it makes sense to reduce the scale of the x and y axes by 1-1.5%, but again in my case everything fell into place.

Anycubic

i3 Mega

No

No

0,2

100