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FreeCAD is an open source 3D design program available for Linux and Windows. It is a 3D parametric modeler, which means that models are designed by adding constraints that determine the relationship between shapes and dimensions. This can make it difficult for beginners faced with a steep learning curve to learn the concept before they can put it into practice. To help make this easier I've created a beginners guide video which goes step through step on getting started using FreeCAD. It goes step by step through the design of a board useful for electronics projects. It includes different technicques including padding a 2D object into a 3D object, creating pockets within those objects and use external edges for adding constraints between different objects. It also uses the resolve method to turn a 2D cut-through image and resolve that into a cylndrical shape.
When creating electronic circuits it's useful to test circuits using a broadboad. During this it's often useful to connect the circuit to a bench power supply and perhaps a multimeter. These often use 4mm banana plugs for connecting to circuits. This is where a workbench breadboard can come in handy.
This beginners video goes step-by-step through creating the above prototyping breadboard holder, designed to make it easier when designing electronic circuits to connect them to a bench power supply, or other equipment using 4mm banana plugs.
There are more guides to creating 3D models and use of a 3D printer at Penguintutor 3D design and 3D print projects
Please view the copyright information regarding use of the circuits.