I needed a quick clip cup holder for mom's walker during the holiday season when they were visiting. I found a decent design on Makerworld, and designed my own quick clip to mount it on my mom's walker. Printed in 70% infill with ABS, the thing is indestructible. It only cost me a couple of $$ instead of the $40-50 the stores wanted. Sharing the Fusion 360 design in case anyone wants to adapt it to a bicycle, or something else (if you want me to provide a specific measurement, I can also do that).
The author remixed this model.
Designed a new mount for the walker bar using Fusion 360, but did not change anything on the cups. Only including the STL's from the original cup holder portion in case the design goes away.