Cherry MX compatible keycap.
Strong and Flexible
This keycap prints a little tight, so it is recommended to pull back some plastic within the stem using a paper clip. Each keycap is printed slightly different because of the irregularities in 3D printing. If purchasing in "strong and flexible" plastic, this keycap will release powder so it is recommended to spray with a clear coat of satin acrylic. This clear coat will also keep the plastic from getting dirty quickly because of the natural porous nylon material.
This keycap is only sold on shapeways.com. All other versions found on any other site are violating my intellectual properties.