CR-X E3D Hemera Mount

thingiverse

If you want to ditch the dual extrusion on the stock CR-X, you can use this model to mount an E3D Hemera to it and print way better. The only caviot is that you will have to make a custom firmware. TH3D has a good firmware kit to add custom firmware. You can also install a different board and adapt all wires to it. That's what I did, Though you have to get a new screen, because the pins won't match up and the screen firmware won't communicate to the board.