Temporary shelf hook for face masks

Nowadays, I use face masks every day because of the COVID epidemic. After using the face mask, I use sprayed ethanol to disinfect the mask. As long the ethanol evaporates, I need a place to prevent any contact between the face mask and the environment. For this purpose, I designed a temporary hook attachable to any shelf or desk. I hope this epidemic will stay only for a few months so I do not want to use ordinary wall hooks which will damage the furniture. So, the shelf hook is fixed temporarily with an M6 screw to the shelf. The mask is hanging on a long M6 screw attached to the printed platform. The M6 can be installed vertically or horizontally.
I designed two versions, one for thick and one for thin shelves.
Stay safe! Enjoy!