I design these in my spare time this is mini me you may assemble the parts with a non toxic superglue, silicon, or epoxy the chamber and chamber bottom cap must be printed solid to prevent any leaks

the stem is designed to be a little wide to accommodate attachments i have included one sample of such an attachment

I also made the top assembly able to screw on and off for easy filling and cleaning

the cap will only screw down as far as the attachment so be careful when making the attachment although as long as the thread grabs even a millimeter or 2 it will pretty much air tight