Customized version of http://www.thingiverse.com/thing:43406 Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=43406 I made this to keep SMD parts in - small and compact, sized for one finger or tweezers to easily pull out parts. You could make it out of conductive filament if ESD is a concern. I redesigned this with 3mm radius as the 5mm was more challenging to make well. I was pleased with the thickness - feels like the right mix between sturdy and not using too much filament.