The firmware on the Duet and Duet WiFi allows you to use up to 4 motor drivers for each axis, until you run out of drivers (max is 10 for the Duet WiFi, 9 for the wired Duets). See [
reprap.org]. We don't yet support independent homing of multiple motors on an axis, but this is likely to be implemented soon because we have a commercial user who wants it.
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].