KSD (keep social distance)

Among the mandatory measures in connection with the COVID-19 pandemic, doctors strongly recommend maintaining "social distance". One of the reasons that people often ignore this recommendation is the lack of a tool that visually shows the required distance.
I offer a simple and effective tool that will allow you and the people around you to see if they are crossing the border of the “social distance”. This tool, let's call it KSD (keep social distance), is designed to be 3D printed so that anyone can get it “here and now”.
Its main part is a laser pointer. The principle of operation is based on the property of human vision to see a line instead of a luminous point, if this point is moving rapidly. KSD allows you to "draw" a circle of a given radius around you.
Laser pointers with housing of 10mm or 13mm in diameter are the most common, and usually used as toys. No need for alteration. Can even be used with an uneven body.
Spring made of elastic wire - for secure fixation of t