Interesting concept, but the atmega32u4 processor on it is too puny to control a 3D printer. It reminds me of the Udoo Quad, but that has an atsam3x8e processor for the real time stuff, which is much more suitable.
Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod
Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].
