Spell Bounded

Earlier Reprap are Cartesian machine consisting of linear motion in X, Y & Z axis.
Plain vanilla in my eye...

Then the delta robot 3D printer shown up. Its love on 1st sight

Rostock by Johann in 2012 is earliest delta robot variant.. With many varients sprung off since its creation since. Namely Kossel, Delta-pi, Cerberus and others

BUT the 3DR by Richard Horne A.K.A Richrap is mesmerizing...

 I can see more reprap of delta format sprouting in a hurry.