This is a fantastic model!
It was printed in white PETG at .2mm fast on my MK3s+ with no supports. It came out great and after putting some rubber grip tape inside to hold the DS Lite without scratching it, even the power button works!
I modified mine after the print by cutting the top edges of the front off so that I could close the lid while in the case, and drilled a hole in the top of the left handle for a stylus holder when not in use.
I decided to remix the model so as to include these changes, and it can be found here: https://www.printables.com/model/169030-modified-ergonomic-grip-for-nintendo-ds-lite-remix
Thanks for your hard work! (edited)