<How to customize Thingiverse "Round Case" Model>

https://youtu.be/ICV2jl3TRLE

Download "Round Case Parametric v1.f3d" file from Thingiverse and open at Fusion 360.

"Section Analysis" is activated initially, so you can see two section components, "R_Cap" and "R_Body".
There are six parameters in this design.

Open "Modify > Change Parameters".
In this table, you can easily customize the design by changing the dimensions.

Of the six favorites, it is usually sufficient to modify only the above three(Case_Outer_Diameter, Cap_Height and Body_Height), and only in special cases to modify the remainder(Wall_Thickness, Coil_Section_Diameter, Tolerance).

If you change the dimensions, you can see they're updated in the design immediately.

Notice!
When changing the dimensions, be careful not to let the top of the coil protrude more than the neck of body. If so, increase the dimension of "Cap_Height" sufficiently.

Have you changed the design as you wish now? Then Click "OK" and close the table.

Now let's create STL files for 3D printing.
In the browser, right-click on the "R_cap" and "R_body" components, and then select "Save As STL" from drop-down menu.
And you'd better choose "High" from "Refinement" option.
Then Click "OK" and save the STL file where you want it.

Now make your custom "Round Case" on a 3D Printer!