Print it laying flat on the side, that way the hook become strong. Recommend PLA with very low layer height, and breakable supports if possible.
Simple to use, just put your thumb in the hole and move it across the orange a couple of times. If it cuts too deep, be gentle on the hand (if the peel is thick the extra length is needed).
The version on the picture is printed with Bambulab X1 Carbon, including AMS with support W.