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(ASK) Delta printer, understanding nozzles position and probe position relative to Bed center position?

Posted by prophet-id 
Delta printer with 2 nozzles and Touch probe.
All positions below are relative to center of the bed which is X:0 Y:0
- The first nozzle is at X:-10 Y:0
- The second nozzle is at X:10 Y:0
- The probe is at X:0 Y:10
And my current firmware setting has:
#define HOTEND_OFFSET_X {0.0, 20.00}
#define X_PROBE_OFFSET_FROM_EXTRUDER 0
#define Y_PROBE_OFFSET_FROM_EXTRUDER -10
#define Z_PROBE_OFFSET_FROM_EXTRUDER -3
#define BED_CENTER_AT_0_0
#define MANUAL_X_HOME_POS 0
#define MANUAL_Y_HOME_POS 0

Currently using Marlin 1.1.0-RC7.
Simplify3D for the slicer/host.

I am wondering if you guys could enlighten me how to handle the Marlin setup for this delta hardware configuration. When I set the firmware's home position at 0,0, my print (from the first nozzle) is offset toward the left of the center.

Please let me know what is the best way as I love to see the print is in the center of the bed, and the probing locations relative to the center too.

Edited 3 time(s). Last edit at 08/01/2016 07:57PM by prophet-id.
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