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I'm trying to calibrated the axis on my v2 so my prints come out the right dimensions but having trouble on it so far. When printing the 5mm stepping cube i get around 5.3-5.5mm. How do i calibrated the steps per mm on a delta and where do I plug in the number? Is it in the eeprom in repetier host or is it somewhere in configuration.h file? Also how do I make corners more defined? the edges on the cubes are more curved than I want them to be.

I calibrated my extruder e steps so I know the incorrect dimensions arent due to over extrusion.

May be things to check.

1) The tension on all arms
2) Calibrating for concave or convexity
3) Z Centre height.
4) The eccentric adjustment for the equal tension on movements.

Yes it might take iterations

might want to double check the arm length numbers, actual vs value in firmware