https://archive.org/details/self-help-devices-for-the-physically-disabled-GOAT
Comments closedisocode: 12 Assistive products for activities and participation relating to personal mobility and transportation
The Whill powerchair joysticks have a hard plastic insert inside a softer rubber cap that fits in a person’s palm. This plastic insert slots onto a metal post, so that it can be rotated and click into place to orient the palm control differently. A common problem with the joystick is that the plastic interior wears away in the spot where it sits on the metal post, causing the joystick to slide around unpredictably.
This 3D printed replacement part is easily made from PLA filament and can be popped into the rubber joystick cap!
https://www.thingiverse.com/thing:7193879

This self-leveling 3D printed cup holder can be attached to a walker, wheelchair, or other device. It would also work with a bicycle or stroller.
https://www.thingiverse.com/thing:3431686
To connect the rings, use M4 x 18mm screws.
