Created this tool to help install spark plug wire boots onto the spark plugs on my classic VW Beetle - they are hard to reach and some require considerable force to install. Made this a few years ago and figured I'd upload it in case anyone else finds it useful.

Should print without support. Slide boot into open end of tool, wire will come out through slot towards handle. This will hold boot securely, push boot onto spark plug by pushing on end of tool. Pull tool off of boot.