Can you do more than 5 points on the Duet for bed probing? If so, how would you set that up in a bed.g file. Right now I have only the 5 points and want to probe more times across the bed. I want like 9-12 points for bed comp.
Are you certain it has a bow in it - have you checked it against a straight edge? The other possibility is that the head is dropping slightly near the centre of the gantry.
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].
