I made it myself. Yes- SketchUp. 🙂 I printed the first, taller wall 3x. No problem. They turned out lovely. Then edited by deleting upper and lower stonework and adding the gargoyles. Put in Cura, saw no issues, rotated 90 degrees, and set to print. Came back after awhile and saw a rectangle! Eek! That's when I tried to diagnose problem. Pulling my hair out! The gaps are there if the wall is perpendicular. So not a SketchUp prob (I think). I will try the Mesh Tools and see what happens.