Here is a new CaseBuilderLib design. It took less than 10 minutes do design this case and it printed perfectly.
I’ve noticed that this case opens up a lot smoother than the (thermometer) previous one. Both cases use the same latch design, except that the thermometer case is narrower. So one thing to keep in mind for a library improvement is, to adjust the tightness of the latch depending on the distance to the hinge.