Slide the print head left until it is at the end of the rail. You can feel it release (lift upwards when it aligns with the cut out notch)

Push the print head unit towards the back of the device and lift the unit from the back rail

Using the spudger, press the spring section of the white pulley

Release the conveyor from the pulley while the spring is still compressed

Remove the conveyor from the gear on the other side of the device