https://community.graphisoft.com/t5/Modeling/Wall-joins-in-archicad-17/m-p/162839#M88005 With the new Priority Based Connection, one element or element skin always cuts the other element or element skin. This is why they are not joined at 45 degrees.<BR /> The Intersection Priority Number of their Building Material will determine which cuts which. The one with the higher Intersection Priority Number cuts the other. If the Intersection Priority Number of the two intersecting element or element skin is exactly the same value, then it will be random which cuts which. Tue, 25 Jun 2013 11:49:33 GMT Laszlo Nagy 2013-06-25T11:49:33Z https://community.graphisoft.com/t5/Modeling/Wall-joins-in-archicad-17/m-p/162837#M88003 <DIV class="actalk-migrated-content"><T>Im having an issue where my wall joins arent joining on 45 degree angles in 3d like with ac 16. when i try to use custom profiles to make a column, it leaves lines in the sides, it also seems to cause issues with wall coverings. the attachment shows how it looks in 3d in ac 17</T></DIV><BR /><IMG src="http://community.graphisoft.com/t5/image/serverpage/image-id/73151iCF5AF3BAF7342AFD/image-size/large?v=v2&amp;px=999" border="0" alt="wall join 1.jpg" title="wall join 1.jpg" /> Wed, 24 May 2023 10:46:22 GMT https://community.graphisoft.com/t5/Modeling/Wall-joins-in-archicad-17/m-p/162837#M88003 Anonymous 2023-05-24T10:46:22Z https://community.graphisoft.com/t5/Modeling/Wall-joins-in-archicad-17/m-p/162838#M88004 turns out this happens when you uncheck legacy connection priorities Mon, 24 Jun 2013 20:46:39 GMT https://community.graphisoft.com/t5/Modeling/Wall-joins-in-archicad-17/m-p/162838#M88004 Anonymous 2013-06-24T20:46:39Z https://community.graphisoft.com/t5/Modeling/Wall-joins-in-archicad-17/m-p/162839#M88005 With the new Priority Based Connection, one element or element skin always cuts the other element or element skin. This is why they are not joined at 45 degrees.<BR /> The Intersection Priority Number of their Building Material will determine which cuts which. The one with the higher Intersection Priority Number cuts the other. If the Intersection Priority Number of the two intersecting element or element skin is exactly the same value, then it will be random which cuts which. Tue, 25 Jun 2013 11:49:33 GMT https://community.graphisoft.com/t5/Modeling/Wall-joins-in-archicad-17/m-p/162839#M88005 Laszlo Nagy 2013-06-25T11:49:33Z