Are stl polygon intersections normal?

Question

3D printers

I am writing a program for creating stl models from templates. Faced such a problem that some parts made according to the template are in contact with each other.
In general, it suits me, but will it also work for printing?
As an example of contact.

The file itself: https://drive.google.com/file/d/1GPIkHukvAEa0VS1Mg...
https://drive.google.com/file/d/1_EHSNGi2oaZngw0SG...