This mount holds the E3D with Bowden fitting by clamping it between the two printed parts. These are screwed together, capturing the E3D between them. I did this for convenience since I constantly change out hot ends for testing, etc and wanted a simple mount with no loose parts. I simply disconnect two wiring connectors (fan and hot end/thermistor) and unscrew three thumbscrews and my hot end comes right off.

Nothing special to make it. I used 50% infill and 3 perimeters so it is strong. I used self-tapping 4-40 x 1/2" screws to assemble it. You could use machine screws and nuts too.