I made a cup holder for my ATX 600 rack (60mm profile). There are a few things that could be improved, but basically it works well, so I'm using my prototype. You need 1x 6mm fusion thread + 1x M6x40mm screw as well as 3x M4 fusion thread and 3x M4x30 screw. The bracket can be a bit loose (it is in my case). To reduce the distance, you can stick some duct tape into the bracket to compensate for the distance to the rack. I printed it out of ABS. There are additional attachments in my other models.
The author marked this model as their own original creation.