How To Trace The Line Of A Print With The Nozzle (With No Plastic Printed) I want to calibrate my printer for my new BLTouch (Ender 3 using Marlins 1.1.9), every time I adjust the values in the configuration.h and send it to the printer I end up having to wait for the nozzle and the bed to heat up, it also wastes plastic. 
Is there a way to take out the values in the code that make the extruder turn without causing any damage.
the slicer that I am using is Cura and the print that I want to trace is this calibration crosshair. Any help will be greatly appreciated.
Sure. Comment out your E values and the temp set/wait lines:

...
M109 S245
M190 S120
...
G1 X123.113 Y95.644 E12.81357  F250
G1 X125.613 Y94.214 E13.06364 ; skirt
G1 X128.409 Y93.523 E13.31370 ; skirt
G1 X131.287 Y93.624 E13.56377 ; skirt
G1 X133.471 Y94.259 E13.76129     F250 
G1 X133.771 Y94.384 E13.78949 ; skirt
...

Becomes:

...
;M109 S245
;M190 S120
...
G1 X123.113 Y95.644 F250 ; E12.81357 
G1 X125.613 Y94.214 ; E13.06364 ; skirt
G1 X128.409 Y93.523 ; E13.31370 ; skirt
G1 X131.287 Y93.624 ; E13.56377 ; skirt
G1 X133.471 Y94.259 ; E13.76129     F250 
G1 X133.771 Y94.384 ; E13.78949 ; skirt
...

Now the printer won't wait for any temperatures, and won't dispense any material.