Due to AMS filament pull-back issues I found the most reliable solution to be adding a riser to raise the glass top.
This allows unclipping of the PTFE tube coming out of the printhead and thereby releasing releasing tension on the PTFE tube
This decreases friction on the filament on its almost one meter long journey back into the AMS enough to have it pull back the filament more reliably.

Because I'm using the 'Top Glass Riser with LED Shield' (see link below) I designed a riser that accommodates it.
If you're not using that I recommend adding some kind of felt layer or similar to protect the glass top.

In the 3mf-file you'll find a version with an elevation of 75mm, but I'm also adding a couple zip-files with several different heights.
As they're stackable this means that with these extra variations it should be possible to create almost any height in steps of 5mm.
Just open the 3mf-file and replace all four 3D-models by the respective 4 models in the relevant zip-file.

Link LED Shield:
[https://www.printables.com/model/365027-bambulab-top-glass-riser-4-cob-led-remix-with-led-/files](https://www.printables.com/model/365027-bambulab-top-glass-riser-4-cob-led-remix-with-led-/files)

Note: as always, any stereo images are of the cross-eyed type.
Link: [https://en.wikipedia.org/wiki/Stereoscopy](https://en.wikipedia.org/wiki/Stereoscopy)