This is my version of the basic design by pheneeny with added design elements from BLV, and many others. I used e3d v6 hotend with Bowden extruder mounted on the top rail. I also mounted the display on the top rail since I also use Octoprint with the Raspberry PI 3b mounted to the rail above the mainboard. a 4 channel relay is also housed in the case with the PI. I installed chains for the x and y axis. I have a light bar mounted under the x-axis extrusion which really lights up the work area nicely. The tool fan is mounted directly to the hotend shroud. On the left is the BLTouch sensor for bed leveling. On the right is the fan for object being printed. This setup allows excellent viewing of the work in progress. I upgraded all stepper motors to the 17HS19-2004S1 59Ncm(84oz.in) steppers from Stepperline.