In repetier or pronterface is there a way to flip the axiz graphic 180’ my bed homes back right so both x and y are on opposite directions to the graphic. Im used to it but it occurred to me im not the only one that may find that usefull
There is a universal agreement on axis orientation for any kind of CNC machine (including mills, laser cutters and 3D printers): When looking at the machine from the front, the front left corner of your working envelope will always be the minimum position of X and Y (everything else is simply wrong). All printer hosts show the print area in the same way, so if you tilt your screen back, you will get the exact same orientation as your physical printer.
While it is ok to have the bed home to the back right as the maximum position, you should consider flipping both axes on your printer if it considers that spot its minimum position.
Have you considered to swap situation in your FW and swap endstops? It depends on your printer board and Software. I had a similar problem. Solved it by fixing printer endstops
@Thomas_Sanladerer The Mendel90 has 0,0 at machine back-right. You will have to put on boxing gloves and fight this one out with @nop_head 
Actually a correction. 0,0 is bed-centre on the Mendel90 but minimum is machine back-right.
@Neil_Darlow I’m a Mendel90 user myself (even if it’s not exactly a “stock” version). Like I said, it’s ok to home towards the maximum end of each axis, but the maximum of X and Y needs to be the rear right. Heck, that spot could even be 0, 0, but the front left corner would then consequently need to be -200, -200.
I’m pretty sure that a properly setup Mendel90 uses the endstops correctly as max endstops, but when you simply use a (Prusa) Mendel configuration, you will end up with an inverted X and X axis.