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I've tried a lot to make a 3D model of frustum of cone but have been unsuccessful. How can I model one?

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You can simply add a Cone primitive and adjust the radius of the top (Radius 2) and then adjust the length and or bottom radius as needed.

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  • $\begingroup$ A huge thanks,@iKlsR. This works very well $\endgroup$ – Nib Apr 22 '14 at 9:14
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Starting with a default primitive of a cone and a cube from the add object menu. Place the cube so that it covers the tip you want to cut away.

Add a Boolean Modifier to the cone and set Object to Cube and Operation to Difference. After the modifier is applied you can remove the cube:

enter image description here

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Alternatively

Start with a Cylinder select the top face in Edit Mode and scale the tip S.

enter image description here

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  • $\begingroup$ The problem with Boolean is that it likes to mess with (read: destroy) your topology. Knife Project might be cleaner. $\endgroup$ – wchargin Apr 21 '14 at 23:15

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