Avoiding 'hairy' look on toon material

[zooropa]

Hi. I am trying to get a neat line in my model (using toon material). I have tried to tweak the 'contour angle', but this is just giving me more/less lines. Regardless of the amount of visible lines what I am looking for its to have no grainy, hairy or handsketch look like.
At this moment the Contour quality is set to 15.

Please find attached samples of what I would like to eradicate from my render. I hope this is possible. I checked lot of samples with the toon material and I can see a lot of people manage to have 'clean lines ' for technical drawing outcomes.

Thanks so much!

[zooropa]

I am trying importing other models.
In this case I imported a rhino model. It might be the 'interior edge contour'.
The contour quality is set to 5. Still the hairy lines there.

[DriesV]

Can you upload or share the model you are working with here?
The "hairiness" is likely caused by the curvature of the model. Sharply edged models will yield cleaner/harder lines.

Dries

[zooropa]

Yes DriesV. I can. By the way, the model I uploaded is not the one I need to solve (I can not upload that one).

The model attached in this post was made in Rhino with booleans and fillets. I am not sure why the 'hairy' lines are there, since the curvature is clean in Rhino. I just want the curves don't end rough.

Thanks a lot!