The first time I start a print everything normal until after nozzle wipe, the the nozzle positions above the left front leveling pad, goes up 10 mm instead i’m going down to touch the pad- then it goes back down 10 mm and of course does not tpuch the pad just goes to rewipe.
So I turn off the power switch and the next start performs correctly.
I have seen similar things when running newer firmware with older start gcode. There are a couple commands that need to be added to the start up gcode to clear and reset the bed level calculations.
You can compare what you have with the start gcode in the newest Lulz Cura to see what needs to change.
Can you tell me which commands you changed
I believe later Marlin versions require M420 commands. M420 S0 before the G28 (although the G28 is supposed to turn off bed leveling) and M420 S1 after the G29.
This is Workhorse start gcode. The M420 S0 at the beginning and M420 S1 towards the end are the important ones to prevent the need to reconnect to get the nozzle printing at the bed level.
;This G-Code has been generated specifically for the LulzBot TAZ Workhorse with HE 0.5mm Tool Head
M73 P0 ; clear GLCD progress bar
M75 ; start GLCD timer
G26 ; clear potential ‘probe fail’ condition
M107 ; disable fans
M420 S0 ; disable previous leveling matrix
G90 ; absolute positioning
M82 ; set extruder to absolute mode
G92 E0 ; set extruder position to 0
M140 S{material_bed_temperature_layer_0} ; start bed heating up
M109 R{material_soften_temperature} ; soften filament before homing Z
G28 ; Home all axis
G1 E-30 F100 ; retract filament
M109 R{material_wipe_temperature} ; wait for extruder to reach wiping temp
G1 X-15 Y100 F3000 ; move above wiper pad
G1 Z1 ; push nozzle into wiper
G1 X-17 Y95 F1000 ; slow wipe
G1 X-17 Y90 F1000 ; slow wipe
G1 X-17 Y85 F1000 ; slow wipe
G1 X-15 Y90 F1000 ; slow wipe
G1 X-17 Y80 F1000 ; slow wipe
G1 X-15 Y95 F1000 ; slow wipe
G1 X-17 Y75 F2000 ; fast wipe
G1 X-15 Y65 F2000 ; fast wipe
G1 X-17 Y70 F2000 ; fast wipe
G1 X-15 Y60 F2000 ; fast wipe
G1 X-17 Y55 F2000 ; fast wipe
G1 X-15 Y50 F2000 ; fast wipe
G1 X-17 Y40 F2000 ; fast wipe
G1 X-15 Y45 F2000 ; fast wipe
G1 X-17 Y35 F2000 ; fast wipe
G1 X-15 Y40 F2000 ; fast wipe
G1 X-17 Y70 F2000 ; fast wipe
G1 X-15 Y30 Z2 F2000 ; fast wipe
G1 X-17 Y35 F2000 ; fast wipe
G1 X-15 Y25 F2000 ; fast wipe
G1 X-17 Y30 F2000 ; fast wipe
G1 X-15 Y25 Z1.5 F1000 ; slow wipe
G1 X-17 Y23 F1000 ; slow wipe
G1 Z10 ; raise extruder
M109 R{material_probe_temperature} ; wait for extruder to reach probe temp
G1 X-9 Y-9 ; move above first probe point
M204 S100 ; set probing acceleration
G29 ; start auto-leveling sequence
M420 S1 ; activate bed level matrix
M425 Z ; use measured Z backlash for compensation
M425 Z F0 ; turn off measured Z backlash compensation. (if activated in the quality settings, this command will automatically be ignored)
M204 S500 ; restore standard acceleration
G1 X0 Y0 Z15 F5000 ; move up off last probe point
G4 S1 ; pause
M400 ; wait for moves to finish
M117 Heating… ; progress indicator message on LCD
M109 R{material_print_temperature_layer_0} ; wait for extruder to reach printing temp
M190 R{material_bed_temperature_layer_0} ; wait for bed to reach printing temp
G1 Z2 E0 F75 ; prime tiny bit of filament into the nozzle
M117 TAZ Workhorse Printing… ; progress indicator message on LCD