Say you need to fix some broken thingy, if you had a 3D printer you might print a replacement – but again, that might also entail that you can actually model the piece. There seem to be a cheaper alternative that at least some of the time might help you out..
Baking soda and super glue – huh, yeah – watch the video, looks legit.. I have not tested it myself yet, but it looks like something worth remembering if something breaks.