Smartphone Chest Strap

This is a smartphone chest strap for sports, trips, and any activities.

I made it because I like to fell like a cyborg. :-D. You can modify the OpenSCAD file for your smartphone. Any smartphone. I used a smartbrick (a brick with dimensions of my smartphone) just for check.

The elastic band has a fabric wrapping it up to protect from scratches. I bought it in sewing supplies store.

I measure the length of elastic band considering 2 loops fitted around my body. Put the hook and cross the elastic band through the holes of the strap. Adjust the loops to have the same diameter. Tie a knot or use a cleat to joint the ends. Voilà.