# TazPro Dual Won't print with Head 2 **URL:** \ **Category:** LulzBot TAZ\ **Created:** [August 5, 2024, 2:50pm UTC](https://forum.lulzbot.com/t/tazpro-dual-wont-print-with-head-2/26875 "2024-08-05T14:50:53Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![CorrectionOptimizer](https://avatars.discourse-cdn.com/v4/letter/c/46a35a/32.png) [@CorrectionOptimizer](https://forum.lulzbot.com/u/CorrectionOptimizer)\ **Post date:** [August 5, 2024, 2:50pm UTC](https://forum.lulzbot.com/t/tazpro-dual-wont-print-with-head-2/26875/1 "2024-08-05T14:50:53Z")
After the latest Firmware update my Pro Dual will not recognize the 2nd hot end when I code it to use it. What is going on? ---
**Author:** ![zenotek](https://avatars.discourse-cdn.com/v4/letter/z/ad7895/32.png) [@zenotek](https://forum.lulzbot.com/u/zenotek)\ **Post date:** [August 5, 2024, 5:40pm UTC](https://forum.lulzbot.com/t/tazpro-dual-wont-print-with-head-2/26875/2 "2024-08-05T17:40:43Z")
Does the LCD show both extruder temperatures or just one? ---
**Author:** ![CorrectionOptimizer](https://avatars.discourse-cdn.com/v4/letter/c/46a35a/32.png) [@CorrectionOptimizer](https://forum.lulzbot.com/u/CorrectionOptimizer)\ **Post date:** [August 5, 2024, 7:03pm UTC](https://forum.lulzbot.com/t/tazpro-dual-wont-print-with-head-2/26875/3 "2024-08-05T19:03:42Z")
Both will heat up. Both will extrude when prompted manually. But only hot-end one will print when the g-code says to use hot-end 2. ---
**Author:** ![zenotek](https://avatars.discourse-cdn.com/v4/letter/z/ad7895/32.png) [@zenotek](https://forum.lulzbot.com/u/zenotek)\ **Post date:** [August 5, 2024, 8:34pm UTC](https://forum.lulzbot.com/t/tazpro-dual-wont-print-with-head-2/26875/4 "2024-08-05T20:34:54Z")
Try adding “T2” at the end of the start gcode. I think it requires it print from 1 and then optionally 2. This will force it to move to extruder 2. ---
**Author:** ![Wrathernaut](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.lulzbot.com/wrathernaut/32/13542_2.png) [@Wrathernaut](https://forum.lulzbot.com/u/Wrathernaut)\ **Post date:** [August 6, 2024, 4:25am UTC](https://forum.lulzbot.com/t/tazpro-dual-wont-print-with-head-2/26875/5 "2024-08-06T04:25:30Z")
In GCODE, T1 is the 2nd extruder. T0 is the first. How are you “coding it to use it”? ---
**Author:** ![zenotek](https://avatars.discourse-cdn.com/v4/letter/z/ad7895/32.png) [@zenotek](https://forum.lulzbot.com/u/zenotek)\ **Post date:** [August 6, 2024, 11:22am UTC](https://forum.lulzbot.com/t/tazpro-dual-wont-print-with-head-2/26875/6 "2024-08-06T11:22:23Z")
Yeah that’s what I meant. I would suggest looking at the actual gcode it’s generating. Maybe you can post the first hundred lines so we can look at it. I personally use Prusaslicer with the dual and it has its own issues that Cura does not, but I am fairly certain it’s smart enough to know which extruder to activate. ---
**Author:** ![zenotek](https://avatars.discourse-cdn.com/v4/letter/z/ad7895/32.png) [@zenotek](https://forum.lulzbot.com/u/zenotek)\ **Post date:** [August 6, 2024, 11:34am UTC](https://forum.lulzbot.com/t/tazpro-dual-wont-print-with-head-2/26875/7 "2024-08-06T11:34:43Z")
I ran a test with Cura 4.13.10, disabled the first extruder, enabled the second, and sliced an object. The start gcode selected the second extruder before starting the print. It does always use the first extruder for probing, and will heat it to wipe, but after G29 it turns off T0 and prints on T1. ---
**Author:** ![CorrectionOptimizer](https://avatars.discourse-cdn.com/v4/letter/c/46a35a/32.png) [@CorrectionOptimizer](https://forum.lulzbot.com/u/CorrectionOptimizer)\ **Post date:** [August 6, 2024, 2:50pm UTC](https://forum.lulzbot.com/t/tazpro-dual-wont-print-with-head-2/26875/8 "2024-08-06T14:50:12Z")
How do I see all the g-code in a sliced object? ---
**Author:** ![Wrathernaut](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.lulzbot.com/wrathernaut/32/13542_2.png) [@Wrathernaut](https://forum.lulzbot.com/u/Wrathernaut)\ **Post date:** [August 6, 2024, 2:53pm UTC](https://forum.lulzbot.com/t/tazpro-dual-wont-print-with-head-2/26875/9 "2024-08-06T14:53:12Z")
Export the gcode to a file instead of sending to the printer. Open the gcode file in a text editor. For just testing the dual color, make two very small objects (like 3mm cubes) of each color on the plate, that way the gcode file will be smaller and easier to examine. ---
**Author:** ![CorrectionOptimizer](https://avatars.discourse-cdn.com/v4/letter/c/46a35a/32.png) [@CorrectionOptimizer](https://forum.lulzbot.com/u/CorrectionOptimizer)\ **Post date:** [August 6, 2024, 4:25pm UTC](https://forum.lulzbot.com/t/tazpro-dual-wont-print-with-head-2/26875/10 "2024-08-06T16:25:50Z")
;FLAVOR:Marlin ;TIME:76282 ;Filament used: 11.8172m, 35.1344m ;Layer height: 0.25 ;MINX:48.508 ;MINY:18.298 ;MINZ:0.42 ;MAXX:262.009 ;MAXY:254.2 ;MAXZ:48.395 ;Generated with Cura\_SteamEngine 4.13.0-BETAv1.5 T0 M104 S245 M104 T1 S180 M105 M109 S245 M105 M109 T1 S180 M82 ;absolute extrusion mode T0 M82 ;absolute extrusion mode ; This profile is designed specifically for the LulzBot TAZ Pro with Dual Extruder Tool Head M73 P0 ; clear GLCD progress bar M75 ; start GLCD timer M107 ; disable fans G90 ; absolute positioning M420 S0 ; disable previous leveling matrix M140 S110 ; begin bed temping up M104 S180 T0 ; soften filament M104 S180 T1 ; soften filament G28 ; home M117 Heating… ; LCD status message M109 R180 T0 ; wait for temp M109 R180 T1 ; wait for temp T0 ; select this extruder first M82 ; set extruder to absolute mode G92 E0 ; set extruder to zero G1 E-10 F100 ; retract 10mm of filament on first extruder G0 X50 F1000 ; move over to switch extruders T1 ; switch extruders M82 ; set extruder to absolute mode G92 E0 ; set extruder to zero G1 E-10 F100 ; retract 10mm of filament on second extruder M104 S170 T0 ; set to wipe temp M104 S170 T1 ; set to wipe temp M106 ; turn on fans to speed cooling T0 ; select first extruder for probing G1 X-16.5 Y100 F2000 ; move above wiper pad M117 Cooling… ; LCD status message M109 R170 T0 ; wait for T0 to reach temp M109 R170 T1 ; wait for T1 to reach temp M107 ; turn off fan G1 Z 1.0 ; push nozzle into wiper G1 X -16.5 Y19 Z20 F1000 ; raise extruder M106 S255 ; turn on fan to blow away fuzzies G4 S5 ; wait 5 seconds M107 ; turn off fan G0 X50 F1000 ; move over to switch extruders T1 ; switch to second extruder G1 X296.5 Y100 F5000 ; move E2 above second wiper pad G1 Z 1.0 ; push nozzle into wiper ---
**Author:** ![CorrectionOptimizer](https://avatars.discourse-cdn.com/v4/letter/c/46a35a/32.png) [@CorrectionOptimizer](https://forum.lulzbot.com/u/CorrectionOptimizer)\ **Post date:** [August 6, 2024, 4:28pm UTC](https://forum.lulzbot.com/t/tazpro-dual-wont-print-with-head-2/26875/11 "2024-08-06T16:28:40Z")
G0 Z5.45 T0 ; set extruder M190 R90 ; get bed temping up during first layer G1 Z2 E0 F75 ; raise head and 0 extruder M82 ; set to absolute mode M400 ; clear buffer M117 TAZ Printing… ; LCD status message ---
**Author:** ![CorrectionOptimizer](https://avatars.discourse-cdn.com/v4/letter/c/46a35a/32.png) [@CorrectionOptimizer](https://forum.lulzbot.com/u/CorrectionOptimizer)\ **Post date:** [August 6, 2024, 4:31pm UTC](https://forum.lulzbot.com/t/tazpro-dual-wont-print-with-head-2/26875/12 "2024-08-06T16:31:37Z")
G92 E0 G92 E0 G1 F1200 E-1.5 ;LAYER\_COUNT:188 ;LAYER:-5 M107 P1 G0 F10200 X113.612 Y36.537 Z0.42 ;TYPE:SUPPORT-INTERFACE G1 F600 E0 G1 F900 X114.277 Y36.335 E0.04576 all coordinates after this. I don’t see where it tells it to start printing with E0… ---
**Author:** ![zenotek](https://avatars.discourse-cdn.com/v4/letter/z/ad7895/32.png) [@zenotek](https://forum.lulzbot.com/u/zenotek)\ **Post date:** [August 6, 2024, 9:09pm UTC](https://forum.lulzbot.com/t/tazpro-dual-wont-print-with-head-2/26875/13 "2024-08-06T21:09:42Z")
> [@CorrectionOptimizer](#): > > T0 ; set extruder > M190 R90 ; get bed temping up during first layer > G1 Z2 E0 F75 ; raise head and 0 extruder > M82 ; set to absolute mode > M400 ; clear buffer > M117 TAZ Printing… ; LCD status message It’s printing (or starting to print) first from extruder 1 (T0). So something is incorrect in the way you are slicing it. Is the intent to print only from the second extruder? Then you need to disable the first extruder: ![image](https://us1.discourse-cdn.com/flex020/uploads/lulzbot/original/2X/5/50a3b55bc7ee30dc4ecce585ba041cfc81d985c4.png)