V2 now available with less material consumption + updated clearances
As I was not able to find a suitable adapter for the prusament Spools I created a very simple but effective one.
The other spool mountings I found relied on bearings that are placed at the outside of the spool which results in higher momentum that the Extruder need to build up by pulling the filament with the risk of loosing steps.
If the rotating axis of the filament spool is in the middle these forces/momentums are as small as they can be.
Hope this THING is useful for anybody else...