I combined this excellent arcade riser by @HGTelecom with a single 18650 battery shield. Now you can play your Neo Geo Mini with plenty of battery power, and pop in micro USB to recharge at any time. As a side benefit, this adds some weight to the riser which might make it a little more stable. I previously had modified my NGM with an internal battery mod, but this way is much more clean, using an easy-to-remove JST connector, and much more reversible, just tuck away the JST connector inside.
neogeo mini 3D Models to Print - yeggi
STL file Fully 3D Printed Mini Arcade 🕹️・3D printable model to download・ Cults
Free 3D file Neo Geo Mini arcade stand 🕹️・3D printing template to download・ Cults
Free STL file Arcade Joystick case 🕹️・3D print model to download・Cults
Free 3D file Arcade Riser with Battery Bank for Neo Geo Mini 🕹️・Design to download and 3D print・Cults
neogeo mini 3D Models to Print - yeggi
Mini Arcade Base for SNK Neo Geo - +5 Elevated Stand Riser
neogeo mini 3D Models to Print - yeggi
neo geo mvs mv 1b 3D Models to Print - yeggi - page 6
Neo-Geo Arcade Cabinet - Download Free 3D model by Johnstone Barrios (@johnstone) [8cd460c]
Arcade best free STL files for 3D printer・368 models to download・Cults
Neo Geo MVS MV1C Printable case by Marcus9199, Download free STL model