The NOVA Hot End re-attaches magnetically to the arms of the Altair. The fan duct on top of the Hot End needs to face the rear of the printer. Each arm pair should be parallel installed properly as depicted below.
If the Hot End is not installed properly it is likely to detach when in motion.
How to Re-attach the Hot End to the Arms:
Attach the Arms to the Ball Joints on the NOVA Hot End. The black fan duct on top needs to face the rear of the printer and the left and right fan will face the front of Altair. The Arms then attach magnetically to the ball joints and should be parallel | | from the top view when mounted properly. When mounted improperly, the Arm pairs will form a V shape (from top view looking down) and the Hot End will fall off.
