Tuning My Z-Offset Lulzbot Mini Help


I am trying to tune my Z-Offset for my Lulzbot Mini and I can’t seem to find the right height for my filament. Hopefully someone here might be able to lend a hand. I am using a Lulzbot Mini with the Aerostruder Upgrade. I am using Overture 2.85mm White PLA. I am also using the modular heated bed upgrade. I have tried adjusting Z-Offset in Cura with the M851 Command and M500 to save the setting, everywhere from -1.40 to -1.57 with not much change in results. I do have a E3D “Sock” on the end of my extruder (https://smile.amazon.com/gp/product/B07779TP4S/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1)

Please see picture below and the attached STL file I have been using to test my Z-Level offset. I have tried with and without a heated bed with the same result.

Google Photos

I have been trying to use this guide to find the right height:

Also I find it odd that things seem to work fine on the outside but then as you get closer to the center they start to warp. I have been printing on the center of my bed, and this is a band new piece of Glass/PEI but I have been having the issue since before I changed the print bed.

See G-Code Below of my most recent attempt without a heated bed:

;Generated by Cura LulzBot Edition GCodeWriter Version: 3.6.20
;Filament used: 0.181659m
;Layer height: 0.25
;Generated with Cura_SteamEngine 3.6.20
M82 ;absolute extrusion mode
;This G-Code has been generated specifically for the LulzBot Mini with Aerostruder V1
M73 P0 ; clear GLCD progress bar
M75 ; Start GLCD Timer
G26 ; clear potential ‘probe fail’ condition
M107 ; disable fans
M420 S0 ; disable leveling matrix
G90 ; absolute positioning
M82 ; set extruder to absolute mode
G92 E0 ; set extruder position to 0
M140 S0 ; start bed heating up
G28 ; home all axes
G0 X0 Y187 Z156 F200 ; move away from endstops
M109 R140 ; soften filament before retraction
G1 E-15 F75 ; retract filament
M109 R140 ; wait for extruder to reach wiping temp
G1 X45 Y173 F11520 ; move above wiper pad
G1 Z0 F1200 ; push nozzle into wiper
G1 X42 Y173 Z-.5 F4000 ; wiping
G1 X52 Y171 Z-.5 F4000 ; wiping
G1 X42 Y173 Z0 F4000 ; wiping
G1 X52 Y171 F4000 ; wiping
G1 X42 Y173 F4000 ; wiping
G1 X52 Y171 F4000 ; wiping
G1 X42 Y173 F4000 ; wiping
G1 X52 Y171 F4000 ; wiping
G1 X57 Y173 F4000 ; wiping
G1 X77 Y171 F4000 ; wiping
G1 X57 Y173 F4000 ; wiping
G1 X77 Y171 F4000 ; wiping
G1 X57 Y173 F4000 ; wiping
G1 X87 Y171 F4000 ; wiping
G1 X77 Y173 F4000 ; wiping
G1 X97 Y171 F4000 ; wiping
G1 X77 Y173 F4000 ; wiping
G1 X97 Y171 F4000 ; wiping
G1 X77 Y173 F4000 ; wiping
G1 X97 Y171 F4000 ; wiping
G1 X107 Y173 F4000 ; wiping
G1 X97 Y171 F4000 ; wiping
G1 X107 Y173 F4000 ; wiping
G1 X97 Y171 F4000 ; wiping
G1 X107 Y173 F4000 ; wiping
G1 X112 Y171 Z-0.5 F1000 ; wiping
G1 Z10 ; raise extruder
G28 X0 Y0 ; home X and Y
G0 X0 Y187 F200 ; move away from endstops
M109 R140 ; wait for extruder to reach probe temp
M204 S300 ; set probing acceleration
G29 ; start auto-leveling sequence
M420 S1 ; enable leveling 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 S2000 ; restore standard acceleration
G28 X0 Y0 ; re-home to account for build variance of earlier mini builds
G0 X0 Y187 F200 ; move away from endstops
G0 Y152 F4000 ; move in front of wiper pad
G4 S1 ; pause
M400 ; wait for moves to finish
M117 Heating… ; progress indicator message on LCD
M109 R200 ; wait for extruder to reach printing temp
M105; ; wait for bed to reach printing temp
G1 Z2 E0 F75 ; prime tiny bit of filament into the nozzle
M117 Mini Printing… ; progress indicator message on LCD

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G0 F2625 X88.117 Y53.469
G1 F900 X100.532 Y65.884 E176.81277
G0 F2625 X100.532 Y65.177
G1 F900 X88.824 Y53.469 E177.36431
G0 F2625 X89.531 Y53.469
G1 F900 X100.532 Y64.47 E177.88255
G0 F2625 X100.532 Y63.763
G1 F900 X90.238 Y53.469 E178.36748
G0 F2625 X90.945 Y53.469
G1 F900 X100.532 Y63.056 E178.8191
G0 F2625 X100.533 Y62.349
G1 F900 X91.653 Y53.469 E179.23742
G0 F2625 X92.36 Y53.469
G1 F900 X100.533 Y61.642 E179.62243
G0 F2625 X100.533 Y60.935
G1 F900 X93.067 Y53.469 E179.97414
G0 F2625 X93.774 Y53.469
G1 F900 X100.533 Y60.228 E180.29254
G0 F2625 X100.533 Y59.521
G1 F900 X94.482 Y53.47 E180.57759
G0 F2625 X95.189 Y53.47
G1 F900 X100.533 Y58.814 E180.82934
G0 F2625 X100.533 Y58.107
G1 F900 X95.896 Y53.47 E181.04778
G0 F2625 X96.603 Y53.47
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G0 F2625 X100.533 Y56.692
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G0 F2625 X98.017 Y53.47
G1 F900 X100.533 Y55.985 E181.50322
G0 F2625 X100.533 Y55.278
G1 F900 X98.724 Y53.47 E181.58841
G0 F2625 X99.431 Y53.47
G1 F900 X100.533 Y54.571 E181.6403
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G1 F900 X100.139 Y53.47 E181.65886
G1 F600 E180.15886
M140 S0
M400 ; wait for moves to finish
M140 S0 ; start bed cooling
M104 S0 ; disable hotend
M107 ; disable fans
G92 E5 ; set extruder to 5mm for retract on print end
M117 Cooling please wait ; progress indicator message on LCD
G1 X5 Y5 Z158 E0 F10000 ; move to cooling position
G1 E5 ; re-prime extruder
M105; ; wait for bed to cool down to removal temp
M77 ; Stop GLCD Timer
G1 X145 F1000 ; move extruder out of the way
G1 Y175 F1000 ; present finished print
M140 S0; keep temperature or cool down
M84 ; disable steppers
G90 ; absolute positioning
M117 Print Complete. ; print complete message

M82 ;absolute extrusion mode
;End of Gcode

I think the washers are 1.5mm thick. I’m not at my printer but it occurs to me that I adjusted mine to the neighborhood of -1.1 to -1.2. So your offset of -1.4 could be raised (a less negative value) and see how that works. Maybe try -1.3 or -1.2?

You want a little squish on layer #1 … but you can also achieve that by adjusting the slicer settings. You can adjust the extrusion flow specific to layer #1… sometimes I’ll push that up to around 105-110% just for layer #1.

Awesome. I guess I need to adjust more than I need too. I ended up with 1.2 as my final height and it seems to be working really well. Thank you! I thought I was too far this whole time when in fact I was squishing my prints too much! Thank you!