Fit Spline is a tool that will allow you to fit sketch segments to a single spline. The Fit Splines are parametrically linked to the underlying geometry, allowing us to make changes and updates at any time!
Lets take a look at this Centerpoint Slot. It breaks down to four segments (labeled).
Which, when extruded, results in a solid body bound by six surfaces, a sight we are all used to seeing.
Now let’s take a look at what the Fit Spline tool can do for us!
We first want to enter the edit sketch mode.
Then, select the sketch, locate the Fit Spline tool from the Tools>Spline Tools> Fit Spline
This will begin the Fit Spline property manager. In this case, it is a closed loop so closed spline is checked. Selecting Delete geometry will remove the original sketch. I tend to leave this field cleared in case I want my original sketch again. The Fit Spline tolerance (to the original sketch) can also be adjusted if need be. When adjustments are complete, select the green check.
Now the sketch can be selected as a single element.
And when we return to the extrusion you will see that this body is now contained by only three surfaces.
Before and After
Additional before and after examples:
If your extrusion (whether is a solid or surface extrusion, swept or otherwise) seems to lack a certain amount of smoothness due to an abundance of sketch entity endpoints, The Fit Spline is just the tool you need!