I just checked the Duet branch of RepRapFirmware and found it was updated yesterday. I see the following changes:
- 5ms start-up delay added
- Support for commands M98 (call subprogram) and M99 (return from subprogram) added.
So nothing very significant for most of us, except that the start-up delay should help those who are using the original SD cards.
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].