My father in law uses the permobil wheelchairs and needed a cup holder for the armrest.
So we made one. and after 20 iterations we came to this, that he has not been able to break yet.
its printed in PETG on an ender3V2. it just fits onto the ender at a slight angle. but on marginally larger printers should fit at an angle. it requires support to print but only at the attachment for the permobil. the two holes below can be used to mount the holder to the holes below the armrest. but we found that the tolerances hold it in firmly without bolts.
The author marked this model as their own original creation.