Summary

A stable up-right charging station for 3ds xl.
STL file is in mm.

Instructions

I used an old USB charger (5V for Blackberry) to provide power. Positive terminal is towards the middle; negative towards the edge.
To couple the power, I used pieces from a ballpoint pen spring.
Works beautifully - you can easily pick up the device and place it in without having to fiddle with it - it starts charging immediately.

NOTE: If you print in PLA, the holding tabs may break. This isn't a big problem as the stand is stable. Just get a gel sticky bumper, trim it down a bit lower and place at the other end to the charging pins. I have one I've used this way for a couple months now without issue.

3ds xl charging station