OpenScad_beginners_tutorial - CSG example 2
thingiverse
Here's how you can enable debugging on OpenSCAD by pressing F5. Then go to Edit -> Preferences in the top menu, and make sure the "Debug modifier" is turned on by ticking its checkbox under the User Interface heading. In the Display options section of the Preferences window, toggle on Background modifier, allowing the difference operation over two spheres and a cube to be viewed more easily, which helps users grasp complex 3D designs and operations at work.
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