See https://3dprint.nih.gov/discover/3dpx-012288 and https://3dprint.nih.gov/discover/3DPX-012446 for original objects. Upgraded version with less instability and customizable text (for name/logos/etc). The dimensions of this model can be changed depending on waht body part you would like to use the applicator for (ie fingers, toes, arms, etc). Commercial equivalents can cost up to $25 per unit, but this model allows for many units to be printed for only the cost of the filament needed! A video of the practical use of this tool can be seen here.