Some shirts fit pretty tight on the neck and its hard to button your shirt.

This button extender will give you a little extra room so you can combine your favorite Tie with that new shirt.

Large version is 4 mm larger and gives a little extra room. Also works better with larger buttons.

Print it with 30% fill, 3 shells.... Rotate the file 180 degree and use supports

Update 13/03/2015*****
Pants Button Extender function
Thanks to our friend Eric, if your pants are too tight scale this up by 175% you might be able to use it to close the button of your pants,