Geeetech

here is a video for the assembly of the dual extruder for pro X, this video was made last year, the linear bearing has changed.
just for referring.

1.assemble the dual extruder carriage
https://www.youtube.com/watch?v=PcyXow1NbWo

2. mount the dual extruder
https://www.youtube.com/watch?v=aKrznCoj4gg

Be sure you have all the parts that needed for the dual extruder,
1. A 20A power supply.
2. A MK8 dual extruder
3.One more A4988 Stepper motor driver.
4. A dual extruder carriage, which is not sale in our store
If you need them, please contact the sales.
As to the firmware, please download it here.
http://www.geeetech.com/forum/download/file.php?id=2191