Hi, yes, it fits tight. Most printers will do a slightly wider first layer and this extra plastic makes it harder to place Marvin. But this extra plastic either goes away on the pressure or you can remove it with a blade as part of the finishing process. I do the second.
I can make the hole bigger but at the end the Marvin will get loose and won´t stand still and fall due to the shape of the feet and the movement of the display.
I made a prototype for a magnetic version but it´s more expensive to build and you´ll need to reprint all the Marvin.