AutoCAD 3D Advice
Creating 3D wireframe models can be more challenging than creating 2D drawings. Here are some advice that will help you work more effectively:
Create sufficient layers to organize your model. Turn off layers that you currently are not working with. That way you reduce the visual complexity of the model. Use different colors can help you differentiate between objects in various views.
Create construction geometry to define the basic envelope of the model.
Create and use multiple views, especially isometric views. Hence making visualization of the model easier. Additionally it becomes easier to select objects.
Become familiar with the User Coordinate System - UCS. Learn how to make the XY plane in UCS parallel with another plane. Learn that Z is the depth in 3D space. The XY plane of the current UCS operates as a work plane to orient planar objects such as rectangles, circles and arcs. The UCS determines the plane of operation for moving, trimming and extending, offsetting, and rotating objects.
Always use object snaps and snap, this will ensure the precision of your model.
Use coordinate filters to easily locate points in 3D based on the location of points on other objects