Unable to create a solid from a custom surface

[g.abbinkN9ZY3]

Hello,

I've been working with Fusion for a while but I can't figure out how to create a solid from a custom surface.
I've created a surface based on another object and need it thickened. Tried multiple things but just can't create a solid.

If any information is needed I will try my best to answer them and provide you with more information

Hope this can be solved

[wmhazzard]

You might have self intersecting surfaces, please attach an f3d file of your model. Also please use the insert photo option instead of attaching them. 

[g.abbinkN9ZY3]

Thanks for the quick reply,

Here's the F3d file as requested

[mango.freund]

[mango.freund]

Take a picture of yourself and put it on calvas. then cut out the nasal areas. greetings mango

[g.abbinkN9ZY3]

Thanks for replying,

I don't really understand why you've send the mask back to me. Also I do not really understand your explanation