A1 back spool holder - all in one pice

In my original design, parts of the spool holder that was supplied with the printer were used. The latest A1-printer uses  one-piece-spool holders. So my version can't be used with the latest version anymore. Therefore I created a new one.

This design offers a version without screws, no additional parts, no supports are necessary. : )
To use the spool holder on the other side of the device, it can simply be mirrored in the slicer.
An angled bar serves as a filament guide. The PTFE tube can be inserted into the tight opening. Some adjustment of the opening may be necessary. The tube should not slip out.

A much nicer solution is the ‘custom filament guide’ from @MakeMorph.
This design is brilliant and works like a charm. I would have liked to integrate this coupling directly into my design. But I don't want to infringe any copyright. My guide is therefore designed so that it can be easily combined with the ‘custom filament guide’. Definitely recommend it!