The spring loaded center tab between the two cup holders had broken off and anything "skinny" would tilt over since the depth of the holder is not deep.
My son had designed it using some CAD software (I use tinkercad, lol)
The holder/adapter should fit a Stanley 40oz tumbler.
Used TPU instead as would need something that can tolerate extreme heat in the summer and don't think PLA would do it.
Unfortunately do need supports but did it with 3% support and still came out.
Highlander_Cup_Holder.stl | 70.2KB |