How to combine self-intersected body?

[Anonymous]

Let's say there is single body, and some parts of it intersects each other (actually, the body was converted from mesh gotten outside, but it does not matter because I was able to create such body even in Fusion 360).

Now I want to merge the body to itself. But Combine operation requires at least 2 different bodies to do its job, whereas I have only one.

If I split the body to separate parts in a way that overlapped parts become related into different bodies, then I can combine them back so overlapped parts will be also combined. But the problem here, the real model is too complex and it self-intersects in many tiny regions, so it's simply not possible to place planes for splitting in exact positions.

[michallach81]

use boundary fill, also look at this: https://forums.autodesk.com/t5/design-validate-document/uroborus-bug/m-p/6255696#M51000

[Anonymous]

Unfortunately, Boundary Fill can't help here, because I already have self-intersected solid. I followed the link you provided and in the end of each example they applied the same technique as me - splitting the body to several non-intersected and then combining them. But in my case it's hard to split a model to isolate all intersected regions.