Gridfinity box to hold a 8BitDo Ultimate controller, 6 batteries and 2 USB.
I did a very rough model of the controller to use it as negative, so it is not the smoothest but it still fit perfectly.
I corrected few things since the model I printed in the photo, also I had to split it in 4 for my small printer.
The author remixed this model.
Perfect fit for the 8BitDo Ultimate