- Your body produces heat.
- Generation and removal of heat must be balanced to keep the body temperature equal.
- Heat transfer is enabed by conduction, convection and radiation.
- If the body temperature equals outside temperature, convection and radiative cooling is reduced
- your body temperature rises till equilibrium is achieved
3D printed stuff is not geat for hygienic reasons because the little groves accumulate dirt over time and is hard to clean. Did you coat the print somehow?