Internal Corner Guard or Corner Liner

These can be used to cover the corner of a wall around the edges, whether you would like to add color to your wall or to have them on there for safety.

USING AS CORNER GUARD RECCOMENDATION: I think the best option if it is being used to make wall corner safer is to use TPU filament, and give it 10% infill, this will give it a nice squishy structure to absorb some impact.