Slight modification of https://www.printables.com/model/540625-wacom-pen-holder to be able to add extra weight using Infill Density while printing.
I printed it with 100% infill density and a 0.12 mm layer height using matte black PLA. It turned out to be 25.9 grams.
The author remixed this model.
Inside of the original model was empty and required adding extra weight inside for stability. I removed the inner walls and closed off the bottom to make it possible to fill using Infill Density while printing.