A simple but sturdy wrench for E14 socket lamp shade nut that won't snap as easily as those that usually come with lighting fixtures. Nut's actual specs may vary slightly as I've found out so you may want to check yours before printing. The part with grooves should be about 32.5 mm in outer diameter and 31.5 inside the groove as shown. The fit is made snug to not to fall off the nut when used upside down.