Once our printer is calibrated (M665 and M666), is it possible to adjust scaling it without modify calibration ?
in other words, my printer is very well calibrated (less than 0.05 after autolevel) but a piece of 5cm is printing 4.87
There are some M codes defined for X and Y scaling. I plan to implement these in RepRapFirmware soon. However, if your print is that far out then I suspect you have a bulld problem that is likely to cause distortion as well. Check that your rod bearing spacing is the same at both ends of each pair of rods.
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].