Use your spare computer screws to act as an adapter for your AAA batteries. This design is great if you want to lighten your mouse or other electronics by up to 30 grams (since many devices use two or more) because regular AA batteries are up to 30 grams each, while lithium-ion AAA batteries are only 10 and 11 grams, such as Eneloop Lite. This battery adapter is only 4 grams in weight and the light veion comes in at only 2 grams. This design is made to be super easy to print, requiring zero supports and zero infills, and no rafting. Just print it, screw in a spare computer screw (the ones for your motherboard, usually 4.3mm), and you're good to go! There are currently three veio; one is a shorty veion that should balance well in just about any piece of electronics, a light veion for those using a wireless mouse (like the Logitech G305 or G304) and an extended veion that is nearly the entire length of the battery with just enough to remove it. The shorty and light veion should be good enough in 99% of cases.