Quick mask buckle or clasp

thingiverse

Elastic facemask straps that go around the ears or head can be easily secured by an adjustable clasp designed for versatility. The first version of this clasp features a slim base to minimize plastic usage and expedite print times. Two posts positioned along the strap slot ensure that slippage is prevented, regardless of material type used. To use, simply slip the knob into the oval hole with pieces aligned at a 90-degree angle, then rotate until the two clips are parallel. Reverse the process to easily remove the clasp.