# How to correct XY mirroring?

So I made a 3D printer from scratch. It is a RepStrap based on a Prusa i3 running Marlin 2.0.x.

It prints fine and accurate, but, The trouble is that the XY plane is mirrored and I don't know how to solve this.

I'm using Marlin 2.0.x on an SKR 1.4 controller board.

Any pointers would be greatly appreciated.

Thanks!

• Make sure X = X and Y = Y. If possible hook up a console or a software application that communicates with the printer, e.g. Pronterface (PrintRun suite) or Repetier Host. The latter options allow for graphical interfacing with the printer; homing, movement, etc. – 0scar Oct 26 '20 at 10:16

If the X and Y motors are connected to the correct ports, you may need to invert the motor directions in firmware. There are #define statements to allow you to do this.