Extend vs Extrude
The biggest difference is that Surface Extrude can "create" a surface body where Extend cannot. It only edits a surface body.
John Hackney, Retired
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The original poster is referring to the Extrude and Extend command, both located under the Surface modeling tools. This Extrude command only creates a surface body and will work with a solid but only to create surface bodies such shown below. I personally find the main use of the surface Extend command is to extend surfaces to other surfaces to create a closed surface boundary for further modeling processes.
John Hackney, Retired
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There are many differences between Extrude and Extend.
Suppose you have a surface created in Revolve like this.
Try running Extrude.
The options include Start Position, Direction, Extent Type, Distance, Angle, etc., allowing for a variety of shapes to be created.
The tangent line is the same as the Extend line, but this one creates a new face as a body.
Next, Extend is executed.
This is an extension of Natural Type, but instead of creating a face, it is literally extended.
When set to Tangent Type, a tangent surface is created just like Extrude, but this is only an auxiliary function of Extend, and its original function is to extend a surface.
Both functions are similar, but there are things that only Extend can do, and there are things that only Extrude can do, so you will have to use them differently depending on the situation.
