I apologize for having made a mistake in writing the previus post.
I Use Freecad0.18 ver. 16117. I downloaded from Gitub the very interesting macro BOXCREATOR. But it does not function.
Though I searched the forum i did not find a solution.
I unfolded the .zip file and copied the _init_.py and boxcreator.py to the directory users\username\appData\roaming\freecad\macro (here are located other functioning macros).
If i run rhe _init_.py have an error message telling me "cannot import name 'boxcreator'
If i run the boxcreator.py nothing happens.
Some years ago i used successfully the macro with earlier version of freecad.
Thanks in advance for help.