The Ford Focus MK2 has a pretty terribly designed cup holder, and with todays drink sizes it fall short quite a bit. I've designed this cup holder adapter that solves this issue and can hold up to a 10cm diameter bottle, and moves the holder forward so that the arm rest does not impede the cup holders ability to do its job.
I'd recommend printing this in ABS or ASA, for heat resistance. Or at the very least printed in PETG.
For smaller printers like the ENDER 3 I've split the model into separate parts that can be glued together post printing.
You will need to print 2 of the “ring” STL files to glue onto the bottom side.
The author marked this model as their own original creation.