Just a very, very basic cup holder.

84mm inner diameter. I put this here so that you can add a cylindrical modifier and not print any top layers for where the cup would sit. I do this so I can see all the cool infill patterns.

I also use this print to get samples of new PLA.

Print instructions

I just use the standard PrusaSlicer PLA preset. Works great.

Can print at 0.3mm layer height for speed.