I am trying to create a bevel effect similar to the attached image. I have set the depth to 30%, size to 1px and soften to 0px, but the final effect has bevels which are not as crisp as those on the attached image - the bevels look very slightly blurred. Any advice on the necessary settings to recreate the bevels seen in this image please?
Set size to 0px on the Bevel to get it very crisp. But 1px schould do exactly what you see in the picture you posted. What I also see in your image is an inner glow (black) which might add to the desired effect you are looking for.
This is depth 100% and size 1px plus an inner glow of 5px and 25%:
Try setting your mode to "Chisel Hard". If that doesn't work, try working with the bevel profile (next selection down on the tree).