Radiosrus
Posts: 2
Joined: Tue Apr 20, 2021 11:28 am

Lulzbot Taz 6 Issues

Does anyone else have an issue where the printer doesn't home the z axis properly? It seems hit or miss where it will try and bed level and wipe the nozzle ~10mm in the air and ultimately fail. It seems to work if I auto home the printer before starting the print.
I imagine there's a problem with the start g-code but don't know what to change. This is the starting g-code it should be the default printer profile.
G26 ; clear probe fail condition
M140 S[bed0_temperature] ; start heating bed
M104 S170 ; start heating extruder
G28 XY ; home X and Y
G1 X-19 Y258 F1000 ; move to safe homing position
M109 S170 ; soften filament for Z homing
G28 Z ; home Z
G92 E0 ; zero extruder
G1 E-12 F100 ; retract 12mm filament
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
G1 X-9 Y-9 ; move above first probe point
M204 S100 ; set accel for probing
G29 ; probe sequence (for auto-leveling)
M204 S500 ; set accel back to normal
G1 X0 Y0 Z15 F5000 ; get out of the way
M400 ; clear buffer
M117 Heating...
M104 S[extruder0_temperature] ; start heating extruder
M190 S[bed0_temperature] ; stabilize bed
M109 S[extruder0_temperature] ; stabilize extruder
G1 Z2 E0 F75 ; extrude filament back into nozzle
M117 TAZ Printing...
Harry-A
Posts: 4
Joined: Thu May 05, 2022 3:20 pm
Location: Ontario, Canada

Re: Lulzbot Taz 6 Issues

Did you find a solution? I'm having a similar problem. The Start Script, which is the same for S3D v5.1.0, seems to be missing something.

Here is the beginning gcode from CURA 3.6.3 Lulzbot Edition:

M82 ;absolute extrusion mode
M221 S100
;This G-Code has been generated specifically for the LulzBot TAZ 6 with standard extruder
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 S60 ; start bed heating up
M109 R140 ; soften filament before homing Z
G28 ; Home all axis
G1 E-30 F100 ; retract filament
M109 R140 ; 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 R140 ; 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 R210 ; wait for extruder to reach printing temp
M190 S52 ; wait for bed to reach printing temp
G1 Z2 E0 F75 ; prime tiny bit of filament into the nozzle
M117 TAZ 6 Printing... ; progress indicator message on LCD

I'm wondering if the missing "M420 S0 ; disable previous leveling matrix" would fix the issue?
S3D-Jason
Posts: 1379
Joined: Sun May 31, 2015 6:01 am

Re: Lulzbot Taz 6 Issues

We have seen the same intermittent behavior from some of our TAZ printers, and it seemed to occur regardless of which slicer we used to create the gcode files. It looked to us like some plastic would occasionally build up on the nozzle tip causing the conductive leveling sensors to get bad readings. I would try to clean the nozzle and the metal leveling touch points really well before attempting the next print to see if that helps.
tenaja
Posts: 157
Joined: Wed Dec 17, 2014 5:16 pm

Re: Lulzbot Taz 6 Issues

S3D-Jason wrote: Tue May 30, 2023 10:14 am We have seen the same intermittent behavior from some of our TAZ printers, and it seemed to occur regardless of which slicer we used to create the gcode files. It looked to us like some plastic would occasionally build up on the nozzle tip causing the conductive leveling sensors to get bad readings. I would try to clean the nozzle and the metal leveling touch points really well before attempting the next print to see if that helps.
The cleaning pad is a consumable... Sometimes we forget this.

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