Need Help Setting Machine Head Size

[154james 0]

Hi guys, let me first start off by saying that I don't own an ultimaker, but I absolutely love cura and it's the only slicer I use. I used to have a printrbot simple and that was easy for the head size to set up, but now I upgraded my simple to a printrbot plus and don't really know how to set the head size, what dimensions should I use per the picture below. I know I need a square around the head (Ubis Hot End) but not sure what else.

 

[Daid 304]

Because the gantry on that printer is quite low, I don't think the head-size settings will be much of a use to you. They are used for one-at-a-time printing. And define the area that the head needs to avoid to hit a print while printing another print.