Modeling - Hhow do I get rid of intersecting faces for 3D Printing

Hi

I searched a lot about the intersecting faces problem. The Slicer for 3D-Printing doesn’t like them and my object has 11-thousands of them. Thats why I can’t follow the tutaorials I found, dealing with every intersection manuall


y.
Isn’t there an add on like ‘make one surface-outside mesh’ or like !boolean operation on one object’ ?

Try Bool tool add-on.