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[–] 2 points 1 year ago (2 children)

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.

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