MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
I'm working on an update that uses the minkowski() function instead of the third-party bevel library. As well as removing the reliance on third-party libraries, it also makes the bevelled edges much smoother. I have also found a way to make the embedded screw holes printable without supports by using cylinders/cones. I'm not entirely happy with it, but it's better than supports (especially on the top). I'm also working on a mod for the Pi 4 option (printing it for testing at the moment) because the USBs and RJ45 ports stick out 1mm further than on previous Pis, so it was a very tight fit.
If I had an original Pi B, I would mod this case for it. However, I can't find any on Amazon or Pi Hut, so I've got nothing to test it against (even if I can find the board dimensions online, nothing beats seeing how it fits in the flesh).
But, yeah, I'm glad you're getting good use out of the case.