Quote Originally Posted by Acorn View Post
I reckon your dimensions are wrong. Do check your tiles do not have a Line width.
Also use Snap to Objects.

Acorn
This is the base tile, which is 2"x2":
https://ibb.co/dQqMC5w

This is what I get when I resize it inside the 20"x20" square. make a copy of the square and use snapping to put the 2 squares together:
https://ibb.co/2hRLTFJ

The result is a non-seamless square.