It is really handy to have for making lots of different parts and many other projects.
Even it the part you need will have to be metal, you can print out a prototype for almost nothing to see if it will work, and make changes if necessary.
Here is a picture of a box I made to mount a digital tach on the dash of my Kubota BX. I drew it up on Tinkercad, a free online cad program, downloaded the file to my slicer program, then uploaded the gcode file to the printer.
A couple of weeks ago, a friend who is restoring his Bronco needed a couple of plastic guides that goe on the sides of the ash tray. He gave me an old one to use as a pattern, and within an hour I had a couple printed out for him. They worked perfectly.