Voron v1.8 bed STL for PrusaSlicer and SuperSlicer
Download the appropriate STL for your bed size (250 or 300mm^2)
Import under Printer Settings > General > Bed Shape (Set ...) > Model (Load...)
Bed texture can be found under the filename bedtexture-v2-250.png which can be found in the SuperSlicer install directory.
Acknowledgements: Mjam#7653 on Discord for the 300mm^2 STL