A simple dual J-Head replacement mount for the original Geeetech dual motor carriage design. Mine warped from heat, weight of 2 motors, and being built of PLA material. This may work with other printers by drilling a hole or 2 in the mounting plate. The back plate is tapered, allowing better airflow and fan positioning. Using 2 of the square adapter blocks. It is relatively simple to adapt the original extruder feed motors, to a bowden connector. This was created with a cad program, using inches. Providing several file options but scad is not one. So I don't have a .scad to share. Import in inches. Using the original 4m x 35m screws, this mounts fine with or without nuts. After a few heat cycles it will loosen, so use nuts to permanently install the body.For the clamp, you will need two or three, 3m x 20m or longer, screws. No nuts required. But you may want to drill the clamp, screw holes, as they are fairly snug. To allow for height adjustment, the right clamp has no center alignment ridge. Install the center screw to hold the clamp and print heads in place. Intentionally leaving the right head higher than the left. Zero out the left Print head then adjust the Right head down to match. Lock them all down with the center and right screws. Confirm the Y-axis alignment against the leading edge of your print surface. You can check and adjust your alignment using this calibration chip. http://www.thingiverse.com/thing:1008954 An X-axis offset of 30.1625mm or 1.1875" for the second extruder. YMMV Double check your nozzle spacing to confirm, and adjust accordingly. This is my first thing. Advice and suggestions welcome Thanks