This is Slot covers for Artillery Sidewinder X1.
This is to avoid filament deposits in the slots under the Heating Bed.
-- Nothing to unscrew , Just clip the covers on the slots --
You have to print :
3x Slot_Cover_Front.stl
3x Slot_Cover_Center.stl
2x Slot_Cover_Back.stl
1x Slot_Cover_Back_small.stl
Or you can print the Full kit:
1x Slot_Covers_Full_kit.stl
The author hasn't provided the model origin yet.