I am unsure to use the formula under the electronics part for both, xy and the z axis because X and y are 2 motors seriell and z just one. (Also I use a CNC shield and not ramps, it says 12-36v input and I will use a 19v notebook PSU to power it, idk if this will change something or if the board steps down that voltage to 12 or whatever) If somebody could explain to me what to use and why I would be really happy 
Also I use drv8825 drivers I think they are called
So I did some research and thinking myself, so if I understand it correctly I have to calculate the power of the motor from the datasheet , look what current I need to get to the power of the motor @12v and then double it because each motor just get 6v in seriell example:
2.8V*2A=5.6W
5.6W/12V=0,466A
0,466A*2=0,922A
But because of longlivity we e do 0,8A
And for Z I will only use 0,466A or 0,4A because longlivity.
Can somebody please confirm if this is near right or completely false. Thanks in advance.
Series is the same as one stepper in terms of those calculations. Typically you can just start at 0.7V and see how that does on a drv8825.
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i also asked in the facebook group and i got a similar answer, i mean i would like to understand why but meh if it works. thanks for the answer! cant wait to get that thing running!
Series takes twice the amperage (which we have plenty to spare), and half the voltage (none to spare) as compared to parallel. If you want detailed info I believe there is a good wiki on the differences between series and parallel.
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