Hi,

I had similar issue on my Flashforge Creator x, unfortunately there was no simple height adjustment screw, so two days after receiving my first 3D printer I was pulling apart the extruder assembly and then using a set of calipers putting it all back together again. The hardest part was being fully aware of the constant threats from the wife along the lines of if you cant get that back together and have wasted all that money don't think your ever buying anything again Blah blah blah.

Geoff has posted some excellent info on extruders in Flashforge forum, and as long as you takes lots of pictures the process isn't as daunting as it can first appear.

Cheers