This is a spool cover for STIGA cordless grass trimmer. In my case it is for the SGT 500 AE.
I cannot guarantee that the lid will also fit other Stiga models!!
The orginial cover has broken and it is only possible to buy the whole spool unit. So I decided to copy the geometry for a printable part.
The original material is PA6 + GF30. The used prototype in the picture is printed with PLA. The final version is printed with PETG and we will see how long it works.
The author marked this model as their own original creation.