I tried to print the bolt and the nut simultaneously.
In terms of design, it was a little difficult to keep the bolts and nuts from interfering.
In printing, care was taken not to fill the gap between the bolt and the nut.
The nut can not escape.
Is something useful?
Is it worth something?
Anyway, I succeeded in getting the wife interested.
If it doesn't work with standard size, try using 103% and 105% size.
captured_nut.stl ... standard size
captured_nut_103%.stl ... increase the xy-size of the nut to 103%
captured_nut_105%.stl ... increase the xy-size of the nut to 105%
The fit of the screw is the point of modeling.
I set internal compensation to 0.5mm. This prevents the inner diameter of the nut from decreasing.