difference between x and y axis in delta 3d printer

Hello, i have built a delta printer "rostock style", all part are cnc made (+-0.01 error), i have done all the possibile calibrations but when i print i have an error/difference between x and y axis , if i print a cube ( whichever dimension) i can measure about 0.3 mm of difference between x and y dimensions. Someone can help me? Can i correct this error with repetier firmware parameters?

Thanks to all!!!

Edited 1 time(s). Last edit at 09/10/2014 03:38PM by mysticman.

If the difference is a constant 0.3mm for all cube sizes, then to me that suggests either you have 0.3mm more backlash in one direction compared to the other, or the nozzle isn't extruding uniformly in all directions. You might like to try rotating the nozzle a quarter turn to see if the 0.3mm difference rotates with it.

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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].