Polystyrene; other resilient plastics will do
Self-adhesive tape; glue will do too
EVA-foam; other thin foam is allowed
Step1: Create the mold.
Note: The mold is used for folding the polystyrene with one hand. But it is not necessary to make this mold.
Saw the wood in the right size. Glue the parts together. Draw the right angle on the wood and sandpaper until correct.
Step 2: Polystyrene
Measure and cut the polystyrene. Use sandpaper to smooth the edges and corners. Place it in the mold and start heating the middle. Once flexible, fold over the mold and let it cool off in this position.
Step 3: EVA-foam
Once the polystyrene has cooled off; put the self-adhesive tape on. Now tape the EVA-foam onto the device.
Step 4: Assemble
Drill a hole at the side for the elastic. Connect the elastic with the device on one side and with the hanger on the other side. Burn the end of the elastic so they won’t ravel.
Step 5: It is ready to be used.