Caravan Window Corner - the thing that converts a square wood hole into a curved window trim

thingiverse

This is 18 point 54 millimeters wide but can be freely scaled along the Z axis. I print at a layer height of 0.2 millimeters - using a 10 percent infill and single nozzle width walls makes it slightly flexible, but about as bendy as the original manufacturer's versions. Used many of these for rebuilding a caravan with replacement wood in the walls.