It's a fully 3d printed lanyard using 2 models from another website and it was made in tinkercad. https://www.myminifactory.com/object/3d-print-id-card-holder-double-and-single-versions-included-82830
https://www.myminifactory.com/object/3d-print-polypanels-quarter-end-90560
Use supports, 3d printer needs a small plastic expansion rate.
The author hasn't provided the model origin yet.