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two things to try...
i just noticed that the spring track is not current with the normal track. i modified the last tooth on the normal track to make it nearly impossible to catch the track on the small gear as appears to have occurred in your picture. I will work with FlamenG to get this updated. In the interim, please print and test a normal track.
In the picture, your PTFE tube does not appear to be mounted to the stand. I am assuming you just mocked this up to show a failure and that what is pictured is not the way you use it. The PTFE tube definitely needs to be mounted to the stand or an accessory arm using a fitting. Any PC4-M10 pass-through fitting (such as these https://www.amazon.com/gp/product/B01IB81IHG/ ) will work.