dual z motors using z and e1 /stepper drivers (marlin)

hi my 1.7 stepper motors are using 1.7amp which it to much to share 1 stepper driver so im trying to get the seconded motor to run of e1 (extruder motor) so i can use z dual motors on z and e1

now ive been on google for a few days now and ive gottenthese bits changed in CONFIGURATION_ADV_H

line 146
#define Z_DUAL_STEPPER_DRIVERS

i wish it was this easy

what am i missing please help

Why not connect your Z stepper motors in series instead? See [reprappro.com]

Edited 1 time(s). Last edit at 02/10/2015 06:41PM by dc42.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].