UPDATE: I made new version you might want to check out.
This makes finding an outlet very easy. No measuring! Just place this gadget on the outlet, place the drywall on the wall and press, it will leave a small dot on the backside of the drywall and then use your drywall knife and connect the dots! Perfect every time.
Use 4 small screws in the holes provided in each corner. The holes are 2 mm. The screws I used are about 2.5mm diameter and about 15mm long and very pointed sheet metal screws.
If the screws come out at an angle not a problem, I just used a Bic lighter for about 10 seconds on each screw and bent them straight in the PLA with a small pair of needle nose pliers.
P.S. If you print this and like it, consider sending me a quick $1 tip. If not, no biggie~!