Very primitive yet functional. just make sure that your print is watertight. The model uses a generic 35mm x 18.5mm humidifier module, with a disc size of 20mm diameter. It also uses a st6845 powerbank module for charging. (you'll have to remove the USB-A socket.) For batteries, an insert for an 18650 battery is made.  Please keep in mind that this project was haphazardly put together, and some sanding might be required to fit all the parts in.