I stumbled upon a cheap PLA+ (always either cheap or pricier but with 30% off) on amazon.de which did not fit the AMS unit. I absolutely LOVE this filament at that price point. Prints perfectly fine on Prusa MK2.5, Elegoo Neptune 3 and Bambu.
In a comment an user suggested the 185mm Spool adapter which I printed and worked well for a single use. Other spools are slightly smaller, or the adapter got worn out. For SUNLU Filas I use the Hydra AMS UnSpAd remix, so I combined both designs together to get an adapter which fits better.
Activeme Speedy PLA+ on Amazon.de (ASIN B0BN64GW4W)
The author remixed this model.
Combined parts of both projects to a single spool adapter.