Cupholder to mount to 8020 rail. You need to print and assemble/glue the parts together but there are pins for alignment of the 2 main parts. It uses a standard metal casino cupholder and a roll in panel part (25-2489, 25 Series Aluminum Roll-in Panel Mount Mount).
You need 1 of everything except 3.4 which you need 2 of.
The author marked this model as their own original creation.