# Sovol Zero – under-extrusion caused by worn extruder gear (Solution update - loose pin)? Need advice on replacement **URL:** \ **Category:** Sovol Zero\ **Tags:** extruder-kit, advice\ **Created:** [March 1, 2026, 4:19pm UTC](https://forum.sovol3d.com/t/sovol-zero-under-extrusion-caused-by-worn-extruder-gear-solution-update-loose-pin-need-advice-on-replacement/9679 "2026-03-01T16:19:38Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![AlexLu](https://avatars.discourse-cdn.com/v4/letter/a/7ea924/32.png) [@AlexLu](https://forum.sovol3d.com/u/AlexLu)\ **Post date:** [March 1, 2026, 4:19pm UTC](https://forum.sovol3d.com/t/sovol-zero-under-extrusion-caused-by-worn-extruder-gear-solution-update-loose-pin-need-advice-on-replacement/9679/1 "2026-03-01T16:19:38Z")
Hi everyone, My Sovol Zero recently started printing very inconsistently. I’m getting clear under-extrusion — layers are thin, gaps appear, and prints fail. Here’s what I’ve already tried: - different filaments - nozzle replacement - calibration and cleaning - checking the filament path The problem remains. After opening the extruder, I noticed that the drive gear looks worn and slightly damaged. It seems to be slipping on the filament. Has anyone experienced this on the Sovol Zero? I’d appreciate advice on: - what exact gear/parts I should replace - any tips from people who already replaced the gear ---
**Author:** ![cardoc](https://avatars.discourse-cdn.com/v4/letter/c/ec9cab/32.png) [@cardoc](https://forum.sovol3d.com/u/cardoc)\ **Post date:** [March 1, 2026, 4:52pm UTC](https://forum.sovol3d.com/t/sovol-zero-under-extrusion-caused-by-worn-extruder-gear-solution-update-loose-pin-need-advice-on-replacement/9679/2 "2026-03-01T16:52:14Z")
I thought the Zero had resolved this. ![image](https://canada1.discourse-cdn.com/flex030/uploads/sovolforum/original/2X/0/06f4f01750dd49e33315b4f2241e069e4f54cc53.jpeg) > **[SV08 Extruder fix by Valerie Moore | Download free STL model | Printables.com](https://www.printables.com/model/968689-sv08-extruder-fix)** ---
**Author:** ![Lion](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.sovol3d.com/lion/32/5586_2.png) [@Lion](https://forum.sovol3d.com/u/Lion)\ **Post date:** [March 1, 2026, 6:02pm UTC](https://forum.sovol3d.com/t/sovol-zero-under-extrusion-caused-by-worn-extruder-gear-solution-update-loose-pin-need-advice-on-replacement/9679/3 "2026-03-01T18:02:02Z")
If that is the issue, print this one. > **[SOVOL EXTRUDER PIN FIX SV08, SV08 MAX, SV ZERO by 3DPrintDemon | Download...](https://www.printables.com/model/1393015-sovol-extruder-pin-fix-sv08-sv08-max-sv-zero)** ---
**Author:** ![AlexLu](https://avatars.discourse-cdn.com/v4/letter/a/7ea924/32.png) [@AlexLu](https://forum.sovol3d.com/u/AlexLu)\ **Post date:** [March 2, 2026, 7:48am UTC](https://forum.sovol3d.com/t/sovol-zero-under-extrusion-caused-by-worn-extruder-gear-solution-update-loose-pin-need-advice-on-replacement/9679/4 "2026-03-02T07:48:00Z")
**Update / Solution:** Thanks everyone for the suggestions! The issue turned out to be a loose pin in the extruder gear assembly. After inserting and securing it properly, the printer feeds filament normally again and prints are back to normal. ![IMG_20260302_104005](https://canada1.discourse-cdn.com/flex030/uploads/sovolforum/original/2X/2/2dfc8ccb9ae991140e82f772499ee08dd129d9d0.jpeg) ![IMG_20260302_101736](https://canada1.discourse-cdn.com/flex030/uploads/sovolforum/original/2X/5/5e31d47171a92e07acf950aa6c9cdd19852dcd9e.jpeg) Appreciate the help! ---
**Author:** ![Lion](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.sovol3d.com/lion/32/5586_2.png) [@Lion](https://forum.sovol3d.com/u/Lion)\ **Post date:** [March 2, 2026, 6:09pm UTC](https://forum.sovol3d.com/t/sovol-zero-under-extrusion-caused-by-worn-extruder-gear-solution-update-loose-pin-need-advice-on-replacement/9679/5 "2026-03-02T18:09:04Z")
I just printed the file I posted above, I didn’t think I had an issue but installed it anyway. Well, once I pushed the print over the connectors I found out mine was out maybe 2mm. I think it might have been resting on the back of the board. Anyway, it’s installed & maybe all Zero users should look into printing a fix. ---
**Author:** ![AlexLu](https://avatars.discourse-cdn.com/v4/letter/a/7ea924/32.png) [@AlexLu](https://forum.sovol3d.com/u/AlexLu)\ **Post date:** [March 2, 2026, 6:31pm UTC](https://forum.sovol3d.com/t/sovol-zero-under-extrusion-caused-by-worn-extruder-gear-solution-update-loose-pin-need-advice-on-replacement/9679/6 "2026-03-02T18:31:20Z")
![IMG_20260302_175308](https://canada1.discourse-cdn.com/flex030/uploads/sovolforum/original/2X/d/d6c0b53871f975a60c71b06ae63716d259450a24.jpeg) Printed this detail. Not shure about all the other pins. ---
**Author:** ![Lion](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.sovol3d.com/lion/32/5586_2.png) [@Lion](https://forum.sovol3d.com/u/Lion)\ **Post date:** [March 2, 2026, 7:13pm UTC](https://forum.sovol3d.com/t/sovol-zero-under-extrusion-caused-by-worn-extruder-gear-solution-update-loose-pin-need-advice-on-replacement/9679/7 "2026-03-02T19:13:03Z")
That is the only pin that has an issue, your all set now. ---
**Author:** ![Piledriver](https://avatars.discourse-cdn.com/v4/letter/p/bb73d2/32.png) [@Piledriver](https://forum.sovol3d.com/u/Piledriver)\ **Post date:** [July 15, 2026, 2:10am UTC](https://forum.sovol3d.com/t/sovol-zero-under-extrusion-caused-by-worn-extruder-gear-solution-update-loose-pin-need-advice-on-replacement/9679/8 "2026-07-15T02:10:33Z")
On my max it was factory secured with a drop of super glue on one side. printed/installed the retainer anyway, fits well.