How to print without z-end stop

[Fjallbacka]

Hi, I’m new to this 3d printing thing and I am struggling with my inductive sensor (I’ve changed the nozzle and it’s different a little bigger and the sensor isn’t working) so I decided to take it out. I wanted to know how can I define a fixed Z position so that the 3d printer starts at it? How can I determine the absolute position? and I’ve seen that my GCODE start script should be like this:

M104 S195 T0 ; heat extruder to 195

M140 S50 ; start heating bed to 50

G28 X0 Y0 ; to set x and y start position while extruder heats

G91 ; relative positioning

G1 X15 F3600 ; move 15cm X

G1 Y15 F3600 ; move 15cm Y

G90 ; absolute positioning

G1 Z?? F3600 ; how can I determine Z absolute position?

M190 S50 ; wait till bed heats to 50 before doing anything

M109 S195 T0 ; wait till extruder heats up to 195 before doing anything

Is it correct? Could it work? Thanks

[steveprinters29]

Set the X and Y to home. Heat the bed and nozzle till they reach an operating temperature. Keep the head about the center of the bed and following this, command down the head in stages till it holds a piece of paper.

After this, send the G92 Z0 to keep the position as Z=0. Command the head up a few mm, remove the paper and start printing.