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Duplicator I3 plus - z level off every time

bed_leveling firstlayer Wanhao_Duplicator_I3 z offset zoffset

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I have a Wanhao duplicator i3 plus mark 2 that always start off the print approximately 1-2mm above the build plate. Regardless of how many times I have leveled it. I use a swipe (purge line) before each print, and that is printed perfectly. The printer seem to move up between the print of the purge line and the actual print, causing the first layer not to stick to the plate.

Anyone with the same issues?

I've not had this problem but Have you got the Z-axis microswitch position set correctly for your plate thickness?

Thanks for the quick reply. Where do I find the micro switch? I have the standard setup I guess. With the build plate that came worth the printer.

Outer edge of left column there should be a row of holes to coarse-adjust the switch. But if you're using the original stick-on build mat then it won't be the cause of your problem. What slicer do you use, and maybe check the G-code for some insight on what it's doing with the Z positioning?

I use Cura for Wanhao as my slicer. I am definitely open to try a different slicer.

I have modified the Gcode a bit to add the purge line. But the original Gcode had the same result with the 1mm distance between nozzle and build plate. I have added both the original and modified gcodes below.

Modified Gcode:
G21 ;metric values
G90 ;absolute positioning
M82 ;set extruder to absolute mode
M107 ;start with the fan off
G28 X0 Y0 ;move X/Y to min endstops
G28 Z0 ;move Z to min endstops
G1 Z15.0 F{travel_speed} ;move the platform down 15mm
G92 E0 ;zero the extruded length
G1 F200 E6 ;extrude 6 mm of feed stock
G92 E0 ;zero the extruded length again
G1 Z0 F{travel_speed} ;move the platform up 15mm
G1 X60 E9 F500 ;start purge line
G1 X100 E13 F500 ;
G92 E0 ;zero the extruded length again
G1 F{travel_speed}
M117 Printing...

Original Gcode:
G21 ;metric values
G90 ;absolute positioning
M82 ;set extruder to absolute mode
M107 ;start with the fan off
G28 X0 Y0 ;move X/Y to min endstops
G28 Z0 ;move Z to min endstops
G1 Z15.0 F{travel_speed} ;move the platform down 15mm
G92 E0 ;zero the extruded length
G1 F200 E6 ;extrude 6 mm of feed stock
G92 E0 ;zero the extruded length again
G1 F{travel_speed}
;Put printing message on LCD screen
M117 Printing...

Thanks for all the help. Much appreciated.