Z-19 rev 1.7 --Creality mod

** Update December 2020: At the brackets' thing page, Psychicpotato reported that the X,Y numbers for the sensors should be negative, "EX: BLTouch is -43x, -9y". I have no way to verify this, as I'm not using the brackets; I had the dummy bracket installed in my printer; and now I've been unemployed for almost a year and haven't touched the printer; it's still in a box. Just thought I'd let you all know in case someone has hard trouble with auto-leveling settings.** ** Update May 23, 2019: I've updated the Autolevel Sensor Brackets for Z-19/Z-23 page with the X and Y numbers info for all sensors supported.** https://www.thingiverse.com/thing:3099237 NOTE: YOU **MUST** PRINT THE BRACKETS together with the Z-19, and use the dummy one if you have no auto-level sensor. The two "feet" (screw guides) on the left side are raised from the metal plate by a couple of millimeters, to make room for a sensor bracket attached there. If you don't have at least the dummy filling that gap, a