Now for size comparison:
The Top one is without fan, the bottom one with fan. Inbetween the stacker (for airflow)
When will you stop improving? I am waiting only for you to finish before I print my Pi cases 
Well, they are ready to print. I just add some other variations 
the variations are interesting. So when I print, I am sure in a couple of weeks I will print new because of some nice variations 
Keep up your good work!