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What are the most useful things you've printed?
(self.3dprinting)
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this post was submitted on 24 Aug 2025
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A AAA-battery to AA-adapter. I randomly had 50 of the smaller ones lying around, so it really came in handy.
Can't share a link, but there should be dozens of this kind of model on any site. "Can't", because the model I grabbed was definitely among the worse ones.
Another good one is the 9v to AAA adapter. 9v batteries are just six AAA batteries in series. They're smaller diameter so you can print a little sleeve to fatten them up. They're also slightly shorter so you can cram a little aluminum foil to meet the contacts. If you have a lot of 9v leftover from work like I do, and it's a great tool.