Headphone shell with magnetic lock

Small container for carrying in-ear headphones.
(e.g. Etymotic HF5)

The lock mechanism is by magnets and using two pairs of magnets with opposite polarisation the lid shuts well but pops open when twisting.

The design fits a total of four small neodymium magnets (5 mm diameter; 5 mm length) which should be easy to obtain. Magnets should not need glueing.

OpenSCAD file included.

Credits for logo: http://simpleicon.com/headphone-8.html