...Thus it might be the application you are looking for when you are planning to create 3D models of machine parts but pretty sure is not what you are looking for when you are more interested in creating computer-animated movies. OpenSCAD is not an interactive modeller. Instead it is something like a 3D-compiler that reads in a script file that describes the object and renders the 3D model from this script file. This gives you (the designer) full control over the modelling process and enables you to easily change any step in the modelling process or make designs that are defined by configurable parameters.
ScreenClip is a free lightweight screen capture utility for Windows.
...Start the utility initially by double-clicking on the downloaded executable file. Place the executable file in your Startup folder to have it start automatically when your computer starts.
Screenclip is a compiled AutoHotKey (AHK) script. See http://ahkscript.org/ for more details.