Humidifier Case

Recently I bought a small USB Humidifier, which basically consist of pcb and ultrasonic module. So, I decided to add a case for it.
Note: filter rod should be preloaded by some spring. I used bended peace of plastic card as a spring and it works fine.
V1.1 Update
Filter holder part changed to bayonet type connector. (Note: I made flange to be pretty tight up to my printer setting, so someone filing may be necessary.).