Herman Miller Mirra Wheel Delete

You will need 5x 40mm M4 bolt that are needed for extra strength. Print with many walls and 30-40% infill. I printed main part with ABS and the socks with TPU. The model has cutouts on inside to make slicer generate extra walls for increased strength. I only tested it with 1st gen Mirra, but it might work with other Herman Miller chairs. It is supposed to fit tight, you might need to twist it a few times to insert. 

Design is inspired by https://www.printables.com/model/414517-office-chair-wheel-delete-11mm-casters/files