Very very interesting, it appears you can make a #harmonic #drive using a #rubber #belt https://hackaday.com/2022/10/31/3d-print.. The result is a #gearbox with very little #backlash at all. A few of these #stacked and you could get an ultra high #torque #motor !
The #uk 's #postoffice #rubber #bands are pretty iconic: https://en.wikipedia.org/wiki/Royal_Mail.. As kids we would use them to launch paper-based projectiles at one another.