A simple clamshell case with a magnetic catch and provision to add a lanyard.

For standard foam earplugs. Ideal for a motorcycle jacket pocket.

Printed in PETG with a PIP hinge and recesses for 2 x [8mm dia / 2mm depth] neodymium magnets. Will print without support but I found that the hole for the lanyard is cleaner with some support (included in the BGcode). I used a dab of superglue to ensure the magnets remained in situ.

Note 1: Magnet (8x2mm) recess is 2.3mm to allow for glue if required - but they should be a strong ‘push-fit’ anyway  

Note 2: A combined 0.4 (2 x 0.2mm) easement is provided - sloping to the hinge

If you fancy something just as practical, but a simpler print and build. Try the click-lock ear-plug container version.

Ear Plug Case (click-lock) by Rosti | Download free STL model | Printables.com