Tried to refine things a little bit and implement suggestions I saw in comments. I recommend printing in thin layers, I did 0.12mm. The tongue for the dongle holder needs supports (see picture). Fitment for the dongle is perfect on my printer but please understand that ymmv and you may need to use some needle files to clean up the overhang. The STL is also a higher fidelity export so you'll see less polygons in the final product.
I thought about fixing the contours to better match the mouse but with my <lack of> skill it'd have been easier to start from scratch and I got lazy. OnShape was giving me a bit of trouble with the .ipt import so this already took more time than I expected.
I have some early versions where I adjusted the front to rear cant (-2.5* and -5*) but haven't updated them to include the USB holder and they lack as much fine tuning. I can update the models and upload them upon request.
.STEP files included for anyone wanting to iterate.
Also shoutout to Dave_The_Knave for sharing the CAD files for remix culture
The author remixed this model.
Added battery door section, adjusted battery support height, added usb dongle holder, added small chamfers