New 3DS XL hand grip - remix

This is a remix of the [fantastic grip created by zeroordie881](https://www.thingiverse.com/thing:1269106). Upon printing that one, I found that the fit was a tad loose from top to bottom and the power button hole didn't quite line up with the actual button. The problem with the loose fit turned out to be because the two small tabs at the top that are supposed to slip into the holes on the rear of the 3ds kept breaking off with the support material. I tried bumps instead, but those too kept brea