Casserole Dishes

I have a dickens of a time creating casserole dishes because they require lids.  Now creating the bottom part, or the bowl, isn't hard.  And creating the lid isn't hard either.  Getting them to fit perfectly together, however, is a near impossible task !!!
The use of callipers should make this an easy task, right ?  After all, you are measuring to a pre-determined size, and the lid corresponds to the calliper measurement.  Oughta fit snuggly together.  Hmmm . . . wish it worked that-a-way.
Oh well, after throwing lots more than many -- here's a small casserole dish which did work.

Happy casseroling days, folks !
Chae