I printed with PETG at 90% infill. Printed the mount on its left side (as you look at it mounted, looking through the printer) for minimal support. I used buildplate support only - the holes seem to make it through just fine, though you might have to clean 'em out a bit with very conservative drilling. I mounted the extruder on the rail that holds the Z-axis bearing rods, and positioned the motor right in front of the Y-axis stepper (barely seen below the extruder mount in the picture). Placing it in the center of the rail gave me the opportunity to trim inches off the bowden tube, while covering the entire build plate. Make sure you experiment with the build plate and how much tube you have to leave behind BEFORE you cut. It's important to re-route the hot-end cabling, and to zip-tie it to the relocated bowden tube. (I hadn't done so yet, and got the electrical cabling hooked around the X-axis gantry while I wasn't looking, which led to much panicky, loud, belt-skipping fun).