This is a nice recreation of the tank mouse, with some good attention to detail. The model prints well and looks good. Unfortunately, if wanting to use as replacement parts for your original,some important dimensions are incorrect. The radius of the four corners on the base and top of the shell are too tight resulting in a mismatch with the original. The buttons are also too narrow and missing the angled stop flanges at the sides that maintain their position and prevent them protruding from the shell. This is probably the most significant problem. The ball retaining cover is missing the grooved ridge surface pattern which allow finger grip when removing the cover. The top of the shell also angles out from the back to front towards the buttons when viewed from above which is not the case for the original. Perhaps this is based on a different model than the original I have but I suspect it just needs a few tweaks to make it much better.