From AvoCADoWiki
Making a simple 3D box
shown for avoCADo 07.03-preAlpha
Step 1. Open avoCADo
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Open avoCADo
Start running avoCADo. You should automatically be placed in the "Sketch" mode, which allows for 2D drawing.
If you need help starting avoCADo, please see the Getting Started page for more information.
Step 2. Draw a rectangle
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Draw a rectangle
Select the "Rect" (short for rectangle) button from the menu on the left.
Then click the mouse and drag it to draw a box on the sketch.
Finally, click the check mark at the bottom left, next to Rect, to finish the operation.
Step 3. Finish the sketch
Select the green "Done" button from the left menu. This will take you to a set of features in the "Build" mode.
Here you can transform your 2D sketch into a 3D solid object.
Step 4. Select extrude
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Select the regions to extrude
Select the "Extrude" tool from the menu on the left, then click in the highlighted area you wish to extrude.
Step 5. Input the height
A small box should be showing at the bottom left of the screen. Type in a new number for the height and click "Done".
Step 6. Rotate the view
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Rotated view of the box
You are probably seeing the box directly from the top so it does not look very 3D yet. To rotate the view, either use the arrow keys on your keyboard or click and drag the middle mouse button to rotate the object.