Help Surface to solid

Capturekl
Capturfde

Hello, I've been trying to transform my STL file from 3D scan to a STEP file for several hours now.

Currently, I have managed to transform my mesh into a surface, but I can't seem to transform my surfaces into a solid... I tried with the thicken tool as well but it makes a mistake for me, I also tried to surface filled by selecting the open loop but it gives me an error as well.

I really need help, I hope you can help me. Thank you.
Head only clean surface Scanto3D. SLDPRT (5.4 MB)

Hello
Judging by the overall shape, it looks like it's a combustion engine piston, even if the scan is of poor quality.

Even if it means spending hours trying to recover it, it would probably be simpler, faster and more geometrically rigorous to rebuild it with the basic functions of SW. In any case, this is the solution I would go for...

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Hello and welcome;

It is always tricky to go from a surface element to a volume element, especially if it comes from a mesh...
Now that you have successfully transitioned from mesh to surfaces, you can try to " cheat " by saving your component in Parasolid " *.xt ", when reimporting the parasolid, Solidwork should try to rebuild a volume itself (depending on the import settings).

image
When opening, also make a 3D repair diagnosis and try to reconstruct first the faces and then the discontinuities.

But as @m_blt suggests... It is often better, and faster, to model the component yourself.