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/thing:173335 Together I've been getting mostly good print quality. But sometimes I ran into problems. Ohmeye's Z isolator has a single bump that sits under a screw hole on the metal bracket on the MM2. It turns out the isolator can catch on that hole, reducing the print quality. This part (light blue above the yellow isolator) provides a smooth surface for the Z isolator, completely covering the holes in the bracket.Print two of these parts, one for each side. Each part has three posts that fit into the existing screw holes to hold them in place. Insert them into the bracket so they're between the bracket and the Z isolator.