# Sovol SV04 Single Print 02 not working **URL:** \ **Category:** Sovol SV04 IDEX\ **Created:** [July 24, 2024, 3:48pm UTC](https://forum.sovol3d.com/t/sovol-sv04-single-print-02-not-working/5362 "2024-07-24T15:48:36Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![schwartzworks](https://avatars.discourse-cdn.com/v4/letter/s/8e8cbc/32.png) [@schwartzworks](https://forum.sovol3d.com/u/schwartzworks)\ **Post date:** [July 24, 2024, 3:48pm UTC](https://forum.sovol3d.com/t/sovol-sv04-single-print-02-not-working/5362/1 "2024-07-24T15:48:36Z")
Sovol SV04 firmware 1.1.4, Cura 5.7.2 (Mac) When trying to access the right extruder in “Single Print 02” mode the printer stills uses the left extruder. I have read the posts in this forum and modified the gcode-file according to Bjoerns instructions but nothing helps. In Cura there is not single-print alternative for the right extruder, the left extruder is chosen by default. Where in the gcode-file is this choice documented? And how would I have to change the code for single-print in Cura (in “Settings”) to change the choice of extruder? Any help is appreciated. ---
**Author:** ![Bjoern](https://avatars.discourse-cdn.com/v4/letter/b/46a35a/32.png) [@Bjoern](https://forum.sovol3d.com/u/Bjoern)\ **Post date:** [July 24, 2024, 7:45pm UTC](https://forum.sovol3d.com/t/sovol-sv04-single-print-02-not-working/5362/2 "2024-07-24T19:45:04Z")
Hi & welcome to the forum! The Marlin firmware documentation can be found on their [homepage](https://marlinfw.org/). G-Code is documented [here](https://marlinfw.org/meta/gcode/). Not being a Cura user I assume there should be SV04 profiles for each print mode available. In order to ensure that your code is processed by the right extruder you could open your gcode-file with a text-editor & search for [tool-selection instructions](https://marlinfw.org/docs/gcode/T.html) and change all lines of code beginning with `T0` into `T1`. /R Björn ---
**Author:** ![schwartzworks](https://avatars.discourse-cdn.com/v4/letter/s/8e8cbc/32.png) [@schwartzworks](https://forum.sovol3d.com/u/schwartzworks)\ **Post date:** [July 25, 2024, 8:05am UTC](https://forum.sovol3d.com/t/sovol-sv04-single-print-02-not-working/5362/3 "2024-07-25T08:05:52Z")
Hi Bjoern, thanks for the assistance. I have done programming but am new to G-code. Looking at the .gcode files I found that Cura puts the commands for choosing extruder BEFORE the “Start G-code” block, and there seems to be no way to access this code in Cura (at least I did not find any possibility). Instead, I can choose which extruder to use in the menu, by choosing 2 extruders for “Single Mode 2” and then de-activating the first one. Not exactly intuitive, but it does the job. Problem solved - thank you! Maybe this is the wrong place for a question like this, but anyways: are there other slicers that work better with the SV04, i.e. are more refined? For example I noticed the extruders bumping into each other at the end of Dual Mode. Or are glitches like this a firmware issue? BR Ekkehard ---
**Author:** ![Bjoern](https://avatars.discourse-cdn.com/v4/letter/b/46a35a/32.png) [@Bjoern](https://forum.sovol3d.com/u/Bjoern)\ **Post date:** [July 25, 2024, 5:22pm UTC](https://forum.sovol3d.com/t/sovol-sv04-single-print-02-not-working/5362/4 "2024-07-25T17:22:30Z")
Hello Ekkehard, there are lots of different slicers available, therefore I try to avoid discussions about pros’s & con’s of slicers - it is comparable to flavors. My favorite slicer flavor is [PrusaSlicer](https://www.prusa3d.com/page/prusaslicer_424/)… Bumping extruders in Dual Mode might be a “feature” of Sovol’s stock firmware. Sovol did not release the sources of their Version v1.1.4, but in v1.1.0 there is a bug that activates the left extruder when the end of the print file is reached - this can cause severe problems with the rest of instructions in the command queue… /R Björn ---
**Author:** ![schwartzworks](https://avatars.discourse-cdn.com/v4/letter/s/8e8cbc/32.png) [@schwartzworks](https://forum.sovol3d.com/u/schwartzworks)\ **Post date:** [July 25, 2024, 7:42pm UTC](https://forum.sovol3d.com/t/sovol-sv04-single-print-02-not-working/5362/5 "2024-07-25T19:42:40Z")
Hi Björn, I agree, we should keep the “which-is-the-best-slicer” outside of this forum. It just appears that the SV04 profiles in Cura aren’t very well developed (which may be OK for private use but could possibly create a disaster for professionals). Coming from the automotive industry I am amazed that bugs like extruders bumping into each other aren’t resolved immediately. I will check out the Prusa slicer. BR Ekkehard ---
**Author:** ![Bjoern](https://avatars.discourse-cdn.com/v4/letter/b/46a35a/32.png) [@Bjoern](https://forum.sovol3d.com/u/Bjoern)\ **Post date:** [July 27, 2024, 6:17am UTC](https://forum.sovol3d.com/t/sovol-sv04-single-print-02-not-working/5362/6 "2024-07-27T06:17:25Z")
Hi Ekkehard, actually I have no idea what is under the hood in Sovol’s stock firmware releases since release v1.1.0, because they did not publish their sources, so far. I assume they try to avoid putting effort in printers that already have been sold & focus on bringing new models to the market… Anyhow, the end-of-file bug in dual mode has been fixed in my firmware version [that is available in my GitHub repository](https://github.com/Bjoern70/SV04-IDEX-3D-Printer-Mainboard-Source-code/releases/tag/v1.14.6). /R Björn