MendelMax 2.0 Z Hole Covers

I've been on a quest to improve the print quality of my MendelMax 2.0. My gold standard is the output of the Replicator 2, and I'm getting closer and closer. These parts are my latest improvements and definitely make a difference.

I've been using Ohmeye's Z Isolators (shown in yellow in the photo) from here: https://www.dropbox.com/sh/3uyotd400xp2ef5/2pLnjCypcV/STLs/Z%20Isolators/ohmeye_mm2_isolator_release%202x.STL

And I've also been using my stiff Z couplers: http://www.thingiverse.com/t