Greg's Hinged Extruder
"Planning and preparing for a build" says "Greg's Hinged Extruder" is a popular Cold End.
Thingiverse 8252: Greg's Hinged Accessible Extruder by GregFrost 2011.
Is this what JBFromOZ calls "a Greg's Wades extruder" and ZemcikO hot end calls "wades/gregs extruder" ?
Further reading
"Greg's Wade reloaded" by jonaskuehling 2012.