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extruding, filleting and importing .stl files...

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extruding, filleting and importing .stl files...
I'm still a novice but although Varicad personnel are very helpful and I really like the software, I don't find the user manual or demos very easy to follow -the English is often hard to understand (in my opinion). So I thought I would try here...

Extruding -when I extrude a surface it creates a new object and I then have to join the old and new objects together. That works ok (I saved as an .stl file and that was 3D printable) but when I came to fillet around the outer edge of the modified object the result was quite strange -the system still seems to regard the joined objects as separate and the filleted edge looked very odd. I expect I could solve this if I could find out how to join objects in a way that was more 'final' or complete? (it's a pity that I can't add example images here). So can someone point me towards a better way to join or to extrude that leaves a 'complete' single object?

I though that perhaps by saving as an .stl file and then opening that it might get rid of the vestige joins but I can't see how to import/open an .stl file into Varicad, so if anyone can shed light there that would be great.

Thanks
Boolean
The solution to your question is the boolean operations that you can find in the manual
It is the "add solid" tool on the second row from the top.

This is copied from the reference manual:

Add Solid – ADD, Ctrl + A
Combines two solids into one object. First select the solid to be added, and then select the solid to be added to. Although the final result is the same, the selection order can be important. If the solids have properties such as certain attributes or group membership, the final solid will have the properties of the second selected solid - the root solid.

So click "add solid" tool then click your old object. Then click on your new object. These two objects should now be fused into a single object.
After you combine the extruded solid with the old object, you can use the fillet tool.

I dont think stl is used for importing in any cad software. Even if you could import it, I don't think you can even edit stl files for solid creations. I think stl is more for exporting the solid to things such as a 3D printer.
File format
Use dwg for editing solid within varicad or stp/step to use other CAD software. Only use stl when you have finalize your design

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