Adjustable elastic mask connector

Adjustable connector for over the ear elastic mask loops to ease discomfort on the ears. These have been tested and found useful at Umass and MassGeneral. The original design (https://www.thingiverse.com/thing:4200348) inspired me to redesign with improvements and to offer sldprt and dxf files so others can modify or improve. These could also be cut from thin plywood or plastic with cnc router or laser cutter. They could be hand cut from an empty detergent bottle (HDPE).