Soap bubble box

This is my first attempt to create a "soap bubble box". My girlfriend came up to that idea, but you may see this thing as an inspiration: http://www.thingiverse.com/thing:3449

It may need some updates, though. The hole where you put the wand might be too big, but can be filled with hot glue. I thought: better too big than too small. ;)
The cap fits too strong on the box. You may need to adjust the scad file or to sand down enough plastic. Otherwise you may distribute the water in it when try