Filament Runout sensor problem


There seems to be a design flaw in the Sovol sv06 plus filament runout sensor.
See video: Dropbox - 20230719_132433_1.mp4 - Simplify your life

It happens when a filament spool reaches its final 25% and when it’s less straight than when the spool is fresh. The tighter curvature of the filament now entering the sensor falsely triggers the sensor into runout mode. This causes a halt in the printing, often resulting in failed overnight prints. This needs to be fixed.

Suggestion to SOVOL:
Increase the exit nozzle 30, 40mm on the runout sensor forcing a more straight line of travel as the filament goes through the runout sensor.

Kind Regards / NEWSTREAM

You mounted the sensor wrong.

Before, I had the sensor mounted according to your pictures, and it was worse. The sensor kept halting my prints. Mounting the sensor in a fixed / rigid way, without the free range of movement solved the problem. I no longer get false runouts and everything works perfectly now. The filament’s flow and movement through the now rigidly mounted sensor can no longer force the sensor into an unfortunate angle where the shape and curvature of the filament triggers a false runout.

I made the video to visually demonstrate that the sensor still contains the flaw despite the above workaround. In due course, I’m sure other users will experience the same symptoms as described here.

Kind Regards / NEWSTREAM

i installed this extender to recenter the filament runout sensor and i have no problem with it.

Here is a solution for the over-sensitive filament runout sensor on the Sovol sv06 plus.
See video: Dropbox - 20230720_121838ae_1.mp4 - Simplify your life

This tweak increases the filament’s travel distance through the runout sensor, forcing it to be straight thereby not causing a false runout trigger,

If anyone is interested in the STL, I can provide it on

Kind Regards / NEWSTREAM

@NEWSTREAM I’ve not experienced the issue but I might pre-empt it by installing your guide, if you could make it available that would be great.



Sure thing!

I’m currently improving the design of the runout sensor extension to work better. I discovered that in some rare cases when the extruder is at an extreme left / right (X) position in relation to the spool & sensor, a false runout can still be triggered. I will post here as soon as the V2 is tested and ready for upload.

Kind Regards / NEWSTREAM

I would be very interested in purchasing the design you came up with for the runout sensor, I’m dealing with the exact same issue as you were.

Sorry for my delayed reply - been busy.
I’ve had mixed results so the thing isn’t rock solid but you’re welcome to the file:

I ended up taking the runout sensor apart and fiddling / bending the tension thingy that triggers the runout sensor. So far that’s solved the problem.


Hey thanks for the response, I’ll give both of those a shot lol and thank you for the file.

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