Randomization and 3D-printed disk design
Using a Research Randomizer (We used 3-matic (Materialize; Leuven, Belgium) to compress the disks according to the design (including shape, projection arrangement) of ShotBlocker®. The disks were printed using UV-curable resins into a smooth U shape with projections on one side. The detailed design parameters were as follows: radius for each projection cylinder (RThree-dimensional (3D)-printed disk parameters and appearance. 