Wrote a script to create dimensions in the Blender. Add > Curve > Dimension
3 types of linear dimensions, 1 radius, 1 diameter, 3 corner and 1 note.
It is possible to change the dimension at any time, even after creation.
To this is added the panel. To change the size to select it and click in the panel - change. To exit the changes that would again add new dimensions to press the button - exit change.
You can add a dimension is very simple, just select the two vertices and go to Object mode and a panel click Add Linear dimension or Add 3D dimension.
Now I can direct in Blender to create the drawings.
The script can be taken at: