Hi All, I've now got the printer up to the state of moving all axes and heating, which makes me very happy (thanks e3d for the fast replacement on the DOA rumba). My biggest concern is the Z Endstop - if I home the z axis, it doesn't stop at the glass... I'm fairly used to builds with a mechanical endstop, but in general they're not attached to the head, but the bed or carriage depending on the design. How do I test the endstop, give it 5v on the red line, gnd the black and test for continuity between gnd and the third line? what kind of materials does it detect? Thanks in advance for any input people have on this one?