Many Neo Geo Pockets have come to find themselves without coin cell battery covers over the years. If yours is missing, then this is for you.
This will fit the Neo Geo Pocket (NGP) and Neo Geo Pocket Color (NGPC), but not the Neo Geo Pocket Color Slim (NGPC Slim). It may also fit other devices with similarly designed CR2032 coin cell battery covers.
This design shouldn't require the use of a coin to open or close the cover, though a slot is included in order to function like the original. The ones I have printed have been snug enough to stay in place when closed but allow you to open and close them simply by pushing a bit and turning with your fingers.
I've printed several of these without supports and they work fine, though they may look a little weird. Using supports is recommended, though.
For an excellent NGPC AA battery cover, see funerall's design here. See also my remix of that design to fit the NGP here.