Parametric Spring Contacts Battery Box for AA Cells (Aliexpress Contacts)
thingiverse
I modified the parametric AA battery holder to support the contacts I got on AliExpress: https://www.aliexpress.com/item/100pcs-Battery-Battery-shrapnel-AA-or-AAA-battery-spring-5-No-positive-and-negative-contact-pieces/32881285245.html. They're ever so slightly too big, about 0.7mm, to fit in, so I resized the diameter of the slot they sit in from 9.8 to 10.5.
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