MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
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Filing the point where rack meets frame on the frame itself really helps with how smooth it is. I also suggest sanding down the rack, too (on the inside where they meet). This will make it a lot smoother if you’re using a not-very-precise 3D printer (Makergear M2/3, etc.)

P.S. I only said that Makergear M2/3 are not precise because they are a lot faster, but the Prusa i3 mk2.5 does the job perfectly.