Changed rodends from 70mm to 54mm apart, necessitating new hotend effector and rail effectors.  Radically altered the hotend effector.  Hotends are now much closer together, and each needs its own 30mm fan.  Revamped the hotend clamping, to add space for an (experimental) integrated Z-probing endstop.  The committed files are setup for bowden extruders that are themselves tapped for pushfit connectors - I am using E3d hotends.  There is support for non-integrated extruders, but it is untested.