A boot to go on the bottom of a nasal cannula tube for an oxygen concentrator. I found the tube would kink and block the airflow. This boot will allow the tube to bend about 90 degrees as it comes out of the oxygen concentrator so that the tube will not kink and get blocked.
Printed with 0.2mm layer height, 20% infill and support.
To put on, squeeze the cannula tube into the slot at the side of the boot (putting it in at the top first works best), then slide it down till its on tight.