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How to create a thickness dimension to a closed spline. Can it be offset somehow?

I have created a simple loft using a circle and closed spline. I would like the loft to have a wall thickness of about 3mm. Basically a vase with the circle being the base. I have tried offset, shell, remove face etc. with no success. Your guidance would be much appreciated. Thank you.
https://cad.onshape.com/documents/1136e67e444402cecc3a40ba/w/dd40875dd3c5e943fc5a56d0/e/c5e2761c3886ef6609ed5fe5
https://cad.onshape.com/documents/1136e67e444402cecc3a40ba/w/dd40875dd3c5e943fc5a56d0/e/c5e2761c3886ef6609ed5fe5
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Best Answers
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NeilCooke Moderator, Onshape Employees Posts: 5,891
I bet it will shell at 1mm. The curvature of the spline is too tight for such a big offset.Senior Director, Technical Services, EMEA5 -
S1mon Member Posts: 3,498 PRO
"Show curvature" "Minimum radius" is your friend:
If you adjust the spline so that the minimum radius is greater than 3, you should be able to offset it by that much.Simon Gatrall | Staff Mechanical Engineer | Carbon, Inc.
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Answers
If you adjust the spline so that the minimum radius is greater than 3, you should be able to offset it by that much.
Simon Gatrall | Staff Mechanical Engineer | Carbon, Inc.
Thank you S1mon- I'll endeavour to become more aquainted with minimum radius.