Simple parking target/garage parking indicator

I made this to assist parking in tight garage spaces. The model uses parallax to repeatably park your car precisely without batteries. Use a paint marker to color the grooves on the spine and arms a contrasting color from whatever filament you use. Once you have your car parked exactly as you want it, have a helper use a command strip or double sided tape to mount the parking target on the wall 90 degrees to the left or right of your car so that the lines appear lined up. 

The next time you park, drive forward until the line on the spine appears inline with the arms and you'll be exactly where you were before. I based my design loosely on the “meatball” used by jet pilots to land on an aircraft carrier. Depending on how far away you mount it from your eye, I believe the error in using this device results in 1-2 inches of deviation in your parking location which is pretty good performance for a $0.02 piece of plastic.  Have bad eyesight? Scale the model as large as your printer will allow and it will still work. You could also mount one of these directly in front of your car if lateral deviation is important to you.