Print at 0.1mm layer height or the fit may not be adequate. 40% infill makes a good solid piece.You will need to file the paths for the rods to make them smooth and unobstructed. Keep testing how they ride, so you don't file too much and create room for wobble.With recent versions, I've added some markings to help you be sure the plates are properly aligned. There are two grooves on each piece which should be lined up and at the front of the mount. Above these should be the "MYMAKI" text.This is tweaked from my design on thingiverse for the E3D-v5. See that page for more background.http://www.thingiverse.com/thing:255237