Fail to make the printings fit to each other.

[kostbill]

Hello,

Totally new to 3d printing and I am having a problem.

I bought a flashforge adventurer 3 and I want to print this:
https://www.thingiverse.com/thing:35798 which is a detailed
assembly of the Notre Dame in several pieces.

However, even when I print the first two, they don't seem to fit.
I tried to print in the very good quality setting of the FlashPrint
software, but still nothing.

I have no idea what can be wrong, or how to even start searching.
I am using PLA.

In the attached pic, I try to show what are the part of the prints
cannot fit.

I cannot explain it very good in English because I am not yet familiar
with the terminology (English is not my mother tongue).

Thanks for your time.