I was getting some gaps/artifacts showing up on the Z motor mounts for the EMT8 by whisky_97. The location for these can be seen in Cura just barely. I included some pictures that show it.
My remixed version is on the right in the pictures.
It may depend upon which slicer you use, but these changes helped for me.
The EMT8 by whisky_97 is thing 2818084. https://www.thingiverse.com/thing:2818084
The v2 versions make it not so tight a fit for the conduit. I added these after reading some of the comments to whisky_97.